Version | Date | Description |
---|---|---|

3.3 | TBD | TBD |

3.2 | 2013-04-06 | This is a minor release: It combines bug fixes and new features. Changes to existing features were made in a backwards-compatible way such as to allow drop-in replacement of the v3.1[.1] JAR file. Most notable among the new features are: Framework for automatic differentiation, Lévy distribution, prime numbers, enumerated distributions, real field allowing to use several algorithms (solvers, linear algebra, 3D geometry) with different real-like classes (high accuracy or automatic differentiation), spherical coordinates with gradients and Hessians, reorganized clustering package with different distance implementations. The minimum version of the Java platform required to compile and use Commons Math is Java 5. Users are encouraged to upgrade to this version as this release not only includes bug fixes but also deprecates numerous classes and methods that will be deleted from the next major release (4.0). Caveat: 1. The implementation of the BOBYQA optimization algorithm is in alpha state (cf. MATH-621): Many code paths are untested, and we are looking for volunteers to improve the code readability, robustness and performance and to extend the unit tests suite. 2. A few methods in the FastMath class are in fact slower that their counterpart in either Math or StrictMath (cf. MATH-740 and MATH-901). |

3.1.1 | 2013-01-14 | This is a point release: It fixes a bug that renders version 3.1 unusable in some situations (see details below). |

3.1 | 2012-12-23 | This is a minor release: It combines bug fixes and new features. Changes to existing features were made in a backwards-compatible way such as to allow drop-in replacement of the v3.0 JAR file. Most notable among the new features are: Framework for automatic differentiation, multivariate mixture model distribution, quaternions, Gauss integration framework, Hermite polynomial interpolation, eigenvalue decomposition of non-symmetric matrices, DBSCAN clustering. Most notable among the changes are: Greatly improved precision in the implementation of the Gamma and Beta special functions, optimizers API, deprecation of the sparse vector implementation. The minimal version of the Java platform required to compile and use Commons Math is Java 5. Users are encouraged to upgrade to this version as this release not only includes bug fixes but also deprecates numerous classes and methods that will be deleted from the next major release (4.0). Caveat: 1. The implementation of the BOBYQA optimization algorithm is in alpha state (cf. MATH-621): Many code paths are untested, and we are looking for volunteers to improve the code readability, robustness and performance and to extend the unit tests suite. 2. A few methods in the FastMath class are in fact slower that their counterpart in either Math or StrictMath (cf. MATH-740 and MATH-901). |

3.0 | 2012-03-07 | This is a major release: It combines bug fixes, new features and changes to existing features. Most notable among the new features are: Iterative solvers, Kalman filter, ISAAC RNG, Illinois and Pegasus root finders, enhanced ODE framework, refactored geometry package, Binary Space Partition trees. Most notable among the changes are: Exclusive use of unchecked exceptions, removal of interfaces for which a single implementation is assumed to exist, improved coding and API consistency across packages, performance (matrix product, FFT) and robustness (SVD). Because of the base package name change, this release can be used together with earlier versions of Commons Math. The minimal version of the Java platform required to compile and use Commons Math is Java 5. Users are encouraged to upgrade to this version as, in addition to new features, this release includes numerous bug fixes. Users of Commons Math 2.0-2 should recompile their code against the 3.0 JAR file and must adjust the import statements to use the appropriate org.apache.commons.math3 base package. Most of the compilation errors users will encounter after the switch will be due to moved or deleted classes/interfaces resulting from package reorganization. Caveat: 1. The implementation of the BOBYQA optimization algorithm is in alpha state (cf. MATH-621): Many code paths are untested, and we are looking for volunteers to improve the code readability, robustness and performance and to extend the unit tests suite. 2. A few methods in the FastMath class are in fact slower that their counterpart in either Math or StrictMath (cf. MATH-740). |

2.2 | 2011-03-02 | This is primarily a maintenance release, but it also includes new features and enhancements. Users of version 2.1 are encouraged to upgrade to 2.2, as this release includes some important bug fixes. See the detailed list of changes below for full description of all bug fixes and enhancements. This release contains some minor compatibility breaks with version 2.1 in some internal classes but none of them are in APIs likely to be accessed by user code: the MessagesResources_fr class has been removed (replaced by a properties file); the arguments of the EventState.reinitializeBegin method have changed; some protected fields which already had public accessors in AbstractStepInterpolator have been replaced. There is a behavior change that users of the multiple regression classes should be aware of. In version 2.1, there was no way to estimate models without intercept terms, and, while this was not clear from the documentation, design (X) matrices needed to include initial unitary columns. In 2.2, initial unitary columns are not necessary and whether or not models include intercept terms is configurable. See the change log and javadoc for the classes in org.apache.commons.math3.stat.regression for details. The major new features are: a new FastMath class, both faster, more accurate and with a few additional functions than StrictMath and Math; a new package for floating point arbitrary precision computing, including high level functions like exponential, sine, square root ...; new linear and tricubic interpolators; a new Gaussian curve fitter; a new erfc function; characteristic support for distributions; a set of new Well Equidistributed Long-period Linear (WELL) random generators. |

2.1 | 2010-04-02 | This is primarily a maintenance release, but it also includes new features and enhancements. Users of version 2.0 are encouraged to upgrade to 2.1, as this release includes some important bug fixes. See the detailed list of changes below for full description of all bug fixes and enhancements. This release contains some minor API compatibility breaks with version 2.0: the return type of RealVector.copy() has been changed to AbstractRealVector; the no-argument constructor of MatrixUtils() has been made private; the mapXxxToSelf methods of OpenMapRealVector have been removed and some method return types have been changed in this class; new methods have been added to the RealVector interface; several fields in AdaptiveStepSizeIntegrator have been made final; DummyStepInterpolator requires an additional argument for one of its constructors; some protected fields have been removed from AbstractLeastSquaresOptimizer, AbstractScalarDifferentiableOptimizer and AbstractLinearOptimizer; and the isOptimal(SimplexTableau) method has been removed from SimplexSolver. |

2.0 | 2009-08-03 | This is a major release. It combines bug fixes, new features and changes to existing features. Most notable among the new features are: decomposition algorithms in the linear algebra package (LU, QR, Cholesky, SVD, eigen decomposition) which are based on the popular JAMA API (but much faster); support for sparse matrices and vectors; support for any field-based matrix (Complex, Fraction ...); support for genetic algorithms; several new optimization algorithms (Dantzig's simplex for linear constrained problems, conjugate gradient, Brent); support for curve fitting with special cases for harmonic and polynomial functions; support for state derivative in ODE step handlers; new multistep integrators (Adams-Bashforth and Adams-Moulton) with variable stepsize; regression algorithms; rank transformations; Mersenne twister pseudo random number generator. This release is NOT source and binary compatible with earlier versions of Commons Math. Starting with version 2.0 of the library, the minimal version of the Java platform required to compile and use Commons Math is Java 5. Users are encouraged to upgrade to this version, as in addition to new features, this release includes numerous bug fixes. Users of Commons Math 1.0-1.2 should recompile their code against the 2.0 jar. Most of the compilation errors users will encounter after the switch will be due to classes moved due to package reorganization. These errors are simply solved by adjusting the import statements in users code. |

1.2 | 2008-02-24 | This release combines bug fixes and new features. Most notable among the new features are the estimation, optimization, geometry and ode packages added from the Mantissa library. Implementations of fast Fourier transform, QR decomposition and several numerical integration algorithms have also been added, along with enhancements and extensions to packages included in Commons Math 1.1. This release is source and binary compatible with earlier versions of Commons Math. |

1.1 | 2005-12-17 | This is a maintenance release containing bug fixes and enhancements. All API changes are binary compatible with version 1.0. The enhancements include some new probability distributions, a Fraction class, new matrix and numerical utilities, and a PRNG pluggability framework making it possible to replace the JDK-supplied random number generator in Commons Math (and elsewhere) with alternative PRNG implementations. |

1.0 | 2004-12-06 | Apache Commons Math 1.0 - Initial Release |

Type | Changes | By |
---|---|---|

Added a graphical overview of available continuous distributions to the userguide. Fixes MATH-983. | tn | |

Added Kendall's tau correlation (KendallsCorrelation). Fixes MATH-1051. Thanks to Matt Adereth,devl. | tn | |

"EigenDecomposition" may have failed to compute the decomposition for certain non-symmetric matrices. Port of the respective bugfix in Jama-1.0.3. Fixes MATH-1051. | tn | |

Check for overflow in methods "pow" (class "o.a.c.m.util.ArithmeticUtils"). Fixes MATH-1047. | erans | |

"EigenDecomposition": Using tolerance for detecting whether a matrix is singular. Fixes MATH-1045. Thanks to Sean Owen. | erans | |

Added SparseGradient to deal efficiently with first derivatives when the number of variables is very large but most computations depend only on a few of the variables. Fixes MATH-1036. Thanks to Ajo Fod. | luc | |

Added logDensity methods to AbstractReal/IntegerDistribution with naive default implementations and improved implementations for some current distributions. Fixes MATH-1039. Thanks to Aleksei Dievskii. | psteitz | |

Added ConfidenceInterval class and BinomialConfidenceInterval providing several estimators for confidence intervals for binomial probabilities. Fixes MATH-1038. Thanks to Thorsten Schaefer. | psteitz | |

Simplified and improved performance of "ArithmeticUtils#addAndCheck(long, long)". Fixes MATH-1035. Thanks to derphead. | tn | |

Added new methods to compute the inverse of a matrix to "DiagonalMatrix" and "MatrixUtils". Fixes MATH-1004. Thanks to Ajo Fod. | tn | |

The "BigFraction" constructor will throw a "FractionConversionException" also in case negative values are provided which exceed the allowed range (+/- Integer.MAX_VALUE). Fixes MATH-1029. | tn | |

"Pair": added factory method and "toString" method. Fixes MATH-1041. Thanks to Sean Owen. | erans | |

"AbstractUnivariateStatistic.test(...)" methods have uses outside subclasses; implementation moved to MathArrays.verifyValues(...). Fixes MATH-1002. | sebb | |

The "KalmanFilter" wrongly enforced a column dimension of 1 for the provided control and measurement noise matrix. Fixes MATH-1033. Thanks to Yuan Qu. | tn | |

Fix a typo in the test class of "GeometricDistribution" and ensure that a meaningful tolerance value is used when comparing test results with expected values. Fixes MATH-1037. Thanks to Aleksei Dievskii. | tn | |

Added exact binomial test implementation. Fixes MATH-1034. Thanks to Thorsten Schaefer. | psteitz | |

Added overloaded constructors for subclasses of "RealDistribution" implementations which do not require an explicit "inverseCumulativeAccuracy". The default accuracy will be used instead. Fixes MATH-1018. Thanks to Ajo Fod. | tn | |

Added overloaded methods for "Frequency#incrementValue(Comparable, long)" with int, long and char primitive arguments. Fixes MATH-1001. Thanks to sebb. | tn | |

Added a section to the userguide for the new package o.a.c.m.ml with an overview of available clustering algorithms and a code example. Fixes MATH-1030. Thanks to Thorsten Schäfer. | tn | |

Creating a "Fraction" or "BigFraction" object with a maxDenominator parameter does not throw a "FractionConversionException" anymore in case the value is very close to fraction. Fixes MATH-996. Thanks to Tim Allison. | tn | |

Added new distance metric "EarthMoversDistance". Fixes MATH-1028. Thanks to Thorsten Schäfer. | tn | |

Improve performance of "DiagonalMatrix#preMultiply(RealVector)". Fixes MATH-999. Thanks to Ajo Fod. | tn | |

Added CombinatoricsUtils to the util package, moving binomial coefficients, factorials and Stirling numbers there and adding a combinations iterator. Fixes MATH-1025. | psteitz | |

"PolynomialSplineFunction": added method "isValidPoint" that checks whether a point is within the interpolation range. Fixes MATH-991. | erans | |

"BicubicSplineInterpolatingFunction": added method "isValidPoint" that checks whether a point is within the interpolation range. Fixes MATH-989. | erans | |

Fixed overflow in "HypergeometricDistribution". Fixes MATH-1021. Thanks to Brian Bloniarz. | erans | |

Fixed "nextPermutation" method (in "o.a.c.m.random.RandomDataGenerator"). This bug does not affect applications using a previous version of Commons Math. Fixes MATH-1020. | erans | |

Buggy (private) method "shuffle" in "o.a.c.m.random.RandomDataGenerator" superseded by "MathArrays.shuffle" (cf. MATH-1010). Fixes MATH-1019. | erans | |

Utility to shuffle an array. Fixes MATH-1010. | erans | |

Created "RandomGeneratorFactory" (package "o.a.c.m.random") to reduce code duplication in "RandomDataGenerator". Fixes MATH-1012. | erans | |

Created package ("o.a.c.m.fitting.leastsquares") for least-squares fitting, with implementations of "LevenbergMarquardtOptimizer" and "GaussNewtonOptimizer" adapted to a new ("fluent") API. Fixes MATH-1008. | erans | |

Improved implementation of "sample" method of "UniformIntegerDistribution". Fixes MATH-1011. | erans | |

Add mode function to StatUtils class. Fixes MATH-1007. | sebb | |

Enabled LaTeX expressions in javadoc and site docs via MathJax. Fixes MATH-1006. | psteitz | |

Add mode function to Frequency class. Fixes MATH-1000. | sebb | |

Fixed "MathArrays.linearCombination" when array length is 1. Fixes MATH-1005. Thanks to Roman Werpachowski. | erans | |

Implemented Gauss-Hermite quadrature scheme (in package "o.a.c.m.analysis.integration.gauss"). Fixes MATH-997. | erans | |

Documented limitation of "IterativeLegendreGaussIntegrator" (added warning about potential wrong usage). Fixes MATH-995. | erans | |

In "GaussNewtonOptimizer", check for convergence before updating the parameters estimation for the next iteration. Fixes MATH-993. | erans | |

Added midpoint integration method. Fixes MATH-967. Thanks to Oleksandr Kornieiev. | luc | |

Fixed NullPointerException in 2D and 3D sub-line intersections. Fixes MATH-988. Thanks to Andreas Huber. | luc | |

Added append method to SimpleRegression, making this class map/reducible. Fixes MATH-987. Thanks to Ajo Fod. | psteitz | |

Added append method to StorelessCovariance, making this class map/reducible. Fixes MATH-978. Thanks to Ajo Fod. | psteitz | |

Added method "MathArrays#convolve(double[], double[])" to compute the discrete, linear convolution of two sequences. Fixes MATH-851. Thanks to Clemens Novak. | tn | |

Added low-discrepancy random generator "HaltonSequenceGenerator". Fixes MATH-977. | tn | |

Added low-discrepancy random generator "SobolSequenceGenerator". Fixes MATH-826. Thanks to Sam Halliday. | tn | |

Added "GeometricDistribution" to "o.a.c.m.distribution" package. Fixes MATH-973. Thanks to Mauro Tortonesi. | tn | |

Added "ParetoDistribution" to "o.a.c.m.distribution" package. Fixes MATH-968. Thanks to Alex Gryzlov. | tn | |

Added clarification to the javadoc of "VectorFormat" and derived classes in case "," is used as a separator. Fixes MATH-962. | tn | |

Added "FuzzyKMeansClusterer" to "o.a.c.m.ml.clustering" package. Fixes MATH-898. | tn | |

Fixed inconsistent dimensions preventing use of secondary states in ODE events. Fixes MATH-965. | luc |

Type | Changes | By |
---|---|---|

Fixed wrong array dimensions in secondary equations handling in some cases. Fixes MATH-961. | luc | |

Fixed missing side effects of secondary equations on main state in Ordinary Differential Equations integration. Fixes MATH-960. | luc | |

Fixed inverse cumulative probability for uniform distribution. Fixes MATH-957. Thanks to Evan Ward. | luc | |

All contents of package "o.a.c.m.stat.clustering" refactored into new package "o.a.c.m.ml.clustering" and added support for additional distance measures in package "o.a.c.m.ml.distance": "CanberraDistance", "ChebyshevDistance", "EuclideanDistance" and "ManhattanDistance". Fixes MATH-917,MATH-918,MATH-919,MATH-920. Thanks to Reid Hochstedler. | tn | |

"SpearmansCorrelation" now works correctly in case of a provided "NaturalRanking" with a "NaNStrategy.REMOVED" strategy and the input data contains NaN values. From version 4.0 onwards this strategy will not be supported anymore. Fixes MATH-891. | tn | |

Replaced hard-coded numbers in "LevenbergMarquardtOptimizer". Fixes MATH-956. | erans | |

Fixed loading of test file when path contains a space. Fixes MATH-955. Thanks to Evan Ward. | luc | |

Improved speed of FastMath.abs methods for all signatures, by removing branching. Fixes MATH-954. Thanks to Charles Cooper. | luc | |

Improved speed of several FastMath methods. Fixes MATH-953. Thanks to Charles Cooper. | luc | |

Fixed Complex.reciprocal() for zero argument. Fixes MATH-934. | luc | |

Improved speed of FastMath copysign methods. Fixes MATH-951. Thanks to Charles Cooper. | luc | |

Added Multivariate Normal Mixture Model Fitting by Expectation Maximization. Fixes MATH-817. Thanks to Jared Becksfort. | erans | |

AbstractRealMatrix will now check for rectangular input arrays in its copySubMatrix methods. Fixes MATH-862. | tn | |

Increment iteration counter in optimization algorithms. Fixes MATH-949. | erans | |

Added a way to trigger only increasing or decreasing events in ODE integration. Fixes MATH-811. | luc | |

Fixed missing update in ODE event handlers, when a RESET_STATE is triggered. Fixes MATH-950. | luc | |

Made EmpiricalDisribution smoothing kernel pluggable. Fixes MATH-671. | psteitz | |

Added array-scaling methods to MathArrays. Fixes MATH-946. Thanks to Jared Becksfort. | psteitz | |

Allow direct use of SummaryStatistics in one-way ANOVA. Fixes MATH-877. Thanks to Peter Andrews. | luc | |

Fixed infinite loop when NaN occurs in singular value decomposition. Fixes MATH-947. | luc | |

Added the Lévy distribution. Fixes MATH-460. Thanks to Andrew Waterman. | luc | |

Normal distribution now uses a direct implementation of the inverse error function to compute inverse cumulative probability instead of relying on a numerical solver. This is much faster, more accurate and does not need convergence threshold. | luc | |

Implementations for inverse error function and inverse complementary error functions have been added. Fixes MATH-948. | luc | |

Extended ranges for FastMath performance tests. Fixes MATH-580. | luc | |

Finalized implementation of diagonal matrix. Fixes MATH-925. | luc | |

Added rank revealing QR decomposition. Fixes MATH-630. Thanks to Christopher Nix. | luc | |

ArrayFieldVector can now be constructed from any FieldVector. Fixes MATH-570. Thanks to Arne Plöse. | luc | |

Improved checking of null vector elements. Fixes MATH-861. Thanks to Sébastien Brisard. | luc | |

Added utilities for prime numbers. Fixes MATH-845. Thanks to Sébastien Riou. | luc | |

Fixed generation of long random numbers between two bounds. Fixes MATH-936. | luc | |

Fixed creation of generic array. Fixes MATH-942. Thanks to Piotr Wydrych. | luc | |

Check bounds in multi-start vector optimizers. Fixes MATH-914. | luc | |

Added discrete distributions. Fixes MATH-941. Thanks to Piotr Wydrych. | luc | |

Fixed abstract test class naming that broke ant builds. Fixes MATH-940. Thanks to Piotr Wydrych. | luc | |

Allow covariance to be computed for one-dimensional variables. Fixes MATH-939. Thanks to Piotr Wydrych. | luc | |

Fixed accuracy of 3D Line.revert(). Fixes MATH-938. | luc | |

Improved javadoc to explain how switching functions should behave across events in ODE events detection. Fixes MATH-937. | luc | |

Added Hermite interpolator for RealFieldElement instances. | luc | |

Added RealFieldElement interface to represent anything that is real number like, implemented by both Decimal64, Dfp and DerivativeStructure. | luc | |

Added partial derivatives computation for 3D vectors and rotations. | luc | |

Fixed DerivativeStructure.atan2 for special cases when both arguments are +/-0. Fixes MATH-935. | luc | |

Added accurate linear combination of DerivativeStructure instances, avoiding cancellation. | luc | |

Throw "MathUnsupportedOperationException" from optimizers that do not support constraints (previous behaviour was to silently ignore the "SimpleBounds" argument). Fixes MATH-933. | erans | |

Added conversion of gradients and Hessians from spherical to Cartesian coordinates in 3D. | luc | |

Greater efficiency in "UnitSphereRandomVectorGenerator". Fixes MATH-931. Thanks to Sean Owen. | erans | |

Improved class javadoc wrt convergence criteria and added additional constructors to override the default epsilon and cut-off values in class "SimplexSolver". Fixes MATH-930. | tn | |

Fixed truncated value in "MultivariateNormalDistribution". Fixes MATH-929. Thanks to Piotr Wydrych. | erans | |

Made "BitStreamGenerator" implement the "Serializable" interface. Fixes MATH-927. Thanks to Dennis Hendriks. | erans |

Type | Changes | By |
---|---|---|

Added a (minimal) "DiagonalMatrix" implementation, such that the case of a large number of uncorrelated observations is handled efficiently. Fixes MATH-924. | erans |

Type | Changes | By |
---|---|---|

All contents of package "o.a.c.m.optimization" refactored into new packages "o.a.c.m.optimization" and "o.a.c.m.fitting". Fixes MATH-874. | erans | |

Added methods to EmpiricalDistribution to implement the RealDistribution interface. Fixes MATH-672. | psteitz | |

DBSCAN clustering algorithm (in package "o.a.c.m.stat.clustering"). Fixes MATH-897. Thanks to Reid Hochstedler. | tn | |

Added element-by-element addition, subtraction, multiplication and division (in class "o.a.c.m.util.MathArrays"). Fixes MATH-910. | erans | |

Fixed "pow" method in class "FastMath". Fixes MATH-904. Thanks to Jeff Hain. | erans | |

Created a "maximum number of iterations" stopping criterion in the convergence checkers (package "o.a.c.m.optimization") that allows the optimizers to return the "current best point" even if the convergence criteria are not met. Fixes MATH-902. Thanks to Bruce A. Johnson. | erans | |

Fixed overflow in "sinh" and "cosh" methods in class "FastMath". Fixes MATH-905. Thanks to Jeff Hain. | erans | |

Accuracy improvements of Gamma.logGamma, and implementation of Gamma.gamma. Both new implementations are based on the NSWC Library of Mathematical Functions. Fixes MATH-849. | celestin | |

New constructor in the custom checker classes (package "o.a.c.m.optimization") for passing the number of iterations after which the "convergence test" will return true. This allows an algorithm to return the best solution found (after the user-defined number of iterations) even if it does not meet the other convergence criteria. Fixes MATH-902. | erans | |

Use "NaNStrategy#FAILED" as default strategy in "NaturalRanking". Fixes MATH-906. Thanks to Patrick Meyer. | tn | |

Added a new "SynchronizedRandomGenerator" that wraps another "RandomGenerator" with all methods being synchronized, thus rendering the code thread-safe (at some efficiency cost). Fixes MATH-899. | erans | |

Add new "NaNStrategy": FAILED, used in "RankingAlgorithm" implementations. Any encountered input value that succeeds a "Double#isNaN" check, results in a "NotANumberException". Fixes MATH-893. Thanks to Patrick Meyer. | tn | |

Add new constructor to "SpearmansCorrelation" class which allows to specify the "RankingAlgorithm" to be used. Fixes MATH-892. | tn | |

Fixed naming inconsistencies between Interval and IntervalsSet classes. Fixes MATH-890. | luc | |

Added a method to check points in the Interval class, with a tolerance for boundary. Fixes MATH-889. | luc | |

Added G-test statistics. Fixes MATH-878. Thanks to Radoslav Tsvetkov. | psteitz | |

New "getSquareRoot" method in class "EigenDecomposition" (package "o.a.c.m.linear"). Fixes MATH-883. | erans | |

Added "isSymmetric" and "checkSymmetric" in "MatrixUtils" (package "o.a.c.m.linear"). Fixes MATH-884. | erans | |

Moved private array argument validation methods from ChiSquareTest to MathArrays. Fixes MATH-885. | psteitz | |

New class for generic multivariate mixture model distributions. Fixes MATH-816. Thanks to Jared Becksfort. | erans | |

Use getter/setter methods of super class for access to field "windowSize" in "ListUnivariateImpl". Fixes MATH-759. Thanks to sebb. | tn | |

Improved construction of polygons with an additional constructor, more robust numerically. Fixes MATH-880. | luc | |

Added new methods "merge(Frequency)", "merge(Collection<Frequency>)", "incrementValue(Comparable<?>, long)" and "entrySetIterator()" to the "Frequency" class. Fixes MATH-474. Thanks to Dan Checkoway. | tn | |

Allow unlimited input values for "Dfp#multiply(int)". Fixes MATH-778. Thanks to Sébastien Brisard. | tn | |

Added distance to point to 2D Line and Segment. Fixes MATH-641. Thanks to Curtis Jensen. | luc | |

"PowellOptimizer" (package "o.a.c.m.optimization.direct") uses "BrentOptimizer" as its internal line search optimizer. The fix forces the convergence criterion of "BrentOptimizer" to use function values (instead of domain values). Fixes MATH-783. | erans | |

Numerical accuracy problems arose in "CMAESOptimizer" (in package "o.a.c.m.optimization.direct") when large finite boundaries were specified, because the interval of allowed values was mapped to [0, 1]. This mapping was not necessary and its removal allows finite and infinite boundaries to be used together. Fixes MATH-865,MATH-867,MATH-868. Thanks to Nikolaus Hansen, Frank Hess. | erans | |

Fixed some issues in nth root derivatives at 0. | luc | |

Fixed transformation to a Schur matrix for certain input matrices. Fixes MATH-848. | tn | |

Added matrix "block inversion" (in "o.a.c.m.linear.MatrixUtils"). Fixes MATH-860. | erans | |

"CMAESOptimizer": Solution was not constrained to lie within the provided boundaries. Fixes MATH-864. Thanks to Frank Hess. | erans | |

New "Quaternion" class (package "o.a.c.m.complex"). Fixes MATH-863. Thanks to Julien Anxionnat. | erans | |

Added method to test for floating-point numbers equality with a relative tolerance (class "o.a.c.m.util.Precision"). Fixes MATH-866. Thanks to Yannick Tanguy. | erans | |

Deprecated "FieldVector#getData()" in favor of "toArray()". Fixes MATH-666. | tn | |

Fixed an error in rectangular Cholesky decomposition. Fixes MATH-789. | luc | |

Clarified definition of isSupportXxxBoundInclusive in RealDistribution interface, made code consistent with the definition, and deprecated these methods, marking for removal in 4.0. Fixes MATH-859. | psteitz | |

Performance improvement in computation of the greatest common divisor (in class "o.a.c.m.util.ArithmeticUtils"). Fixes MATH-841. Thanks to Sebastien Riou. | erans | |

Added a check so that the returned point will always be the best one. Fixes MATH-855. | erans | |

Added a NewtonRaphsonSolver that uses the new differentiation package to define the function to solve. This class is intended to replace the former NewtonSolver which is deprecated. | luc | |

Added RandomDataGenerator to replace RandomDataImpl and deprecated RandomData interface and RandomDataImpl class. Deprecated nextInversionDeviate methods from RandomDataImpl class. Ensured that all nextXxx methods in RandomDataImpl/RandomDataGenerator use the configured RandomGenerator. Fixes MATH-850. | psteitz | |

Generate an exception for rare ill-conditioned cases in "HarmonicFitter" guessing procedure (package "o.a.c.m.optimization.fitting"). Fixes MATH-844. | erans | |

New interface for multivariate distributions. Added multivariate normal distribution. Fixes MATH-815. Thanks to Jared Becksfort. | erans | |

Added a utility method to compute Stirling numbers of the second kind. | luc | |

Added a new package dealing with differentials, for one or more free parameters and derivation order 1 or higher. | luc | |

Added additional crossover policies: "CycleCrossover", "NPointCrossover", "OrderedCrossover" and "UniformCrossover". Fixes MATH-777. Thanks to Reid Hochstedler. | tn | |

Improved numerical stability of "SimplexSolver" by introducing Bland's rule to prevent cycling and a cutoff threshold to zero out very small values. Fixes MATH-828. | tn | |

Fixed overflow detection for negative values in constructor of class "Fraction". Fixes MATH-836. Thanks to Baste Nesse Buanes. | tn | |

Fixed overflow in method "percentageValue" in class "Fraction". Fixes MATH-835. Thanks to Baste Nesse Buanes. | erans | |

Raised (to 10) the default number of fractional digits to print out. Fixes MATH-622. | erans | |

Removed duplicate code. Fixes MATH-762. | erans | |

Added a new "RealMatrixFormat" class for input/output of RealMatrix instances. Default formatter instances for commons-math and octave have been added to "MatrixUtils". Fixes MATH-831. | tn | |

New "IterativeLegendreGaussIntegrator" that performs the same automatic subdivision of the integration interval as "LegendreGaussIntegrator", but uses the classes from package "o.a.c.m.analysis.integration.gauss" to perform the Gauss integration on the sub-interval. Deprecated "LegendreGaussIntegrator". Fixes MATH-827. | erans | |

Improve performance of quantile evaluation in "Percentile" class for cases with lots of equal values. Fixes MATH-578. | tn | |

New framework for Gauss integration schemes (in package "o.a.c.m.analysis.integration.gauss"). Gauss-Legendre quadrature rules (of unlimited order) implemented in double precision, and high precision (using "BigDecimal"). Fixes MATH-797. | erans | |

For all distribution classes (in package "o.a.c.m.distribution"), a new constructor takes a "RandomGenerator" parameter. The "RandomDataImpl" instance has been superseded by this RNG. All "sample()" methods have been modified to use this RNG instead of delegating to the methods in "RandomData". Fixes MATH-764,MATH-823. | erans | |

Added support for real asymmetric matrices to "EigenDecomposition". Fixes MATH-235. | tn | |

Re-instated methods to find all complex roots of a polynomial (class "LaguerreSolver" in package "o.a.c.m.analysis.solvers"). Fixes MATH-768. | erans | |

Added accessors to the "Pair" class (package "o.a.c.m.util"). Fixes MATH-810. | erans | |

Added new constructors in "EigenDecomposition" and deprecated two constructors with unused parameters. Fixes MATH-822. Thanks to Jared Becksfort. | tn | |

Added overridden method in "PolynomialFitter" (package "o.a.c.m.optimization.fitting") to limit the number of evaluations. Fixes MATH-798. | erans | |

Added a new constructor to o.a.c.m.utils.IterationManager, allowing for the specification of a callback function in case the maximum number of iteration is reached. Fixes MATH-807. | celestin | |

A new HermiteInterpolator class allows interpolation of vector-valued functions using both values and derivatives of the function at sample points. | luc | |

Parameterized "CurveFitter" class (package "o.a.c.m.optimization.fitting") with the type of the fitting function. Updated subclasses "PolynomialFitter", "HarmonicFitter", "GaussianFitter". Fixes MATH-804. | erans | |

Fixed a problem when building rotations from two pairs of vectors. In very rare cases, due to numerical inaccuracies the computed quaternion was not normalized (some examples went as high as 1.0e8) and even after normalization, the quaternion was plain wrong. Fixes MATH-801. | luc | |

Removed unused fields LocalizedFormats.ALPHA and LocalizedFormats.BETA. This is an acceptable compatibility break, as these fields are only meant for internal use. Fixes MATH-796. | celestin | |

Fix computation of upperCumulativeProbability in "HypergeometricDistribution" and cleanup of duplicate probability mass function. Fixes MATH-644. Thanks to marzieh. | tn | |

In GammaDistribution, deprecated getAlpha() and getBeta(). Replaced with getShape() and getScale(), respectively. Fixes MATH-791. | celestin | |

Use inline computation for OrderedTuple hash code. Fixes MATH-793. Thanks to Sebb. | luc | |

Use modified Lentz-Thompson algorithm for continued fraction evaluation to avoid underflows. Fixes MATH-718. | tn | |

Fixed a wrong assumption on BSP tree attributes when boundary collapses to a too small polygon at a non-leaf node. Fixes MATH-780. | luc | |

Put serialization back for PointValuePair and PointVectorValuePair. Fixes MATH-787. | luc | |

Avoid superfluous null check when using iterators in RealVector and ArrayRealVector. Fixes MATH-627. Thanks to Arne Plöse. | tn | |

Use epsilon instead of ulp in floating-point comparison when dropping columns after phase 1 in SimplexSolver. Fixes MATH-781. Thanks to Scheiber Ernő. | tn | |

Added a workaround for an OpenJDK issue on sparc solaris with too small constants. Fixes MATH-721. | luc | |

Fixed ListPopulation#iterator to return an unmodifiable iterator. Fixes MATH-779. Thanks to Reid Hochstedler. | tn | |

Cleanup of ListPopulation to consistently enforce the population limit. Fixes MATH-775. Thanks to Reid Hochstedler. | tn | |

Use same range check in constructor for ElitisticListPopulation as in corresponding setter. Fixes MATH-776. Thanks to Reid Hochstedler. | tn | |

Fixed unbalanced use of code tags in javadoc of several classes. Fixes MATH-767. Thanks to Dennis Hendriks. | tn | |

Added class FixedElapsedTime (new StoppingCondition for evolution of generations) to genetics package. Fixes MATH-773. Thanks to Reid Hochstedler. | tn | |

Added classes Decimal64 and Decimal64Field, which are wrapper classes around primitive doubles. These classes implement FieldElement and Field, respectively. Fixes MATH-756. | celestin |

Type | Changes | By |
---|---|---|

Added statistical hypothesis tests "MannWhitneyUTest" and "WilcoxonSignedRankTest". Fixes MATH-431. | mikl | |

Classes "CMAESOptimizer" and "BOBYQAOptimizer" inherit from "BaseAbstractMultivariateSimpleBoundsOptimizer" (in package "o.a.c.m.optimization.direct"). Fixes MATH-698. | erans | |

Added pre-computed arrays to speed up initial loading time for FastMath. Fixes MATH-650. | sebb | |

Resources for error messages translations have been moved out of META-INF folder in the jar, to avoid interferences with some build systems. | luc | |

Fixed "doubleValue" and "floatValue" method in "BigFraction" when numerator and denominator are larger than the range of the corresponding primitive type. Fixes MATH-744. Thanks to Thundre. | erans | |

Removed "MathException" (from package "o.a.c.math"). Fixes MATH-488. | erans | |

Removed "MathRuntimeException" (from package "o.a.c.math"). Fixes MATH-459. | erans | |

Merged interface and implementation of statistical tests in o.a.c.m.stat.inference package. Fixes MATH-739. | tn | |

Merged interface and implementation of EmpiricalDistribution. Fixes MATH-670. | tn | |

Relaxed test for equality in UnivariateStatisticAbstractTest. Fixes MATH-588. | tn | |

Modified the genetics package to use localized exception messages. Fixes MATH-575. | tn | |

Fixed a faulty test for zero in TridiagonalTransformer. Fixes MATH-652. Thanks to Greg Sterijevski. | tn | |

Changed algorithm in computation of the covariance matrix in "AbstractLeastSquares" (package "optimization.general"), from "LUDecomposition" to "QRDecomposition". Fixes MATH-664. | erans | |

Fixed rounding error in RandomDataImpl nextInt, nextLong methods causing lower endpoints to be excluded when negative. Also improved robustness of nextUniform for extreme values and changed its contract to throw IAE when provided bounds are infinite or NaN. Fixes MATH-724. Thanks to Dennis Hendriks. | psteitz | |

Fixed "offset by one" bug in "BOBYQAOptimizer". Fixes MATH-728. Thanks to Bruce A. Johnson. | erans | |

Check first step size in embedded Runge-Kutta integrators, and truncate it if needed. Fixes MATH-727. | luc | |

Modified setSeed methods in Bitstream generators (MersenneTwister and Well generators) to clear the cache of normal deviates used by nextGaussian. Fixes MATH-723. | psteitz | |

Fixed bracketing interval balancing in BracketingNthOrderBrentSolver. Fixes MATH-716. | luc | |

Removed unused or duplicate utility methods from "MathUtils". Math functions with "double" arguments were moved to class "FastMath". Fixes MATH-690. | erans | |

Broke up bloated "MathUtils" class into "MathArrays", "Precision", "ArithmeticUtils" classes. Fixes MATH-689. | erans | |

Fixed array indexing error in Variance evaluate method for computing the weighted variance of an array segment. Fixes MATH-704. Thanks to Thomas Neidhart. | psteitz | |

Fixed case of unconstrained variables that still occur in the objective function in simplex solver. Fixes MATH-713. Thanks to Thomas Neidhart. | luc | |

The fast cryptographically secure pseudorandom number generator ISAAC has been added. Fixes MATH-710. Thanks to Eldar Agalarov. | luc | |

The reset method in StepHandler interface has been renamed init and is provided more information on the integration by the calling integrator. A similar init method has been added to the EventHandler interface. Fixes MATH-714. | luc | |

Improved accuracy of Runge-Kutta based step interpolators near step start. Fixes MATH-705. | luc | |

Fixed errors in SummaryStatistics addValue causing variance, mean, or geometric mean statistics not to be updated if they have been overridden using instances of commons-math supplied implementations. Fixes MATH-691. | psteitz | |

Removed First, Third, Fourth moments from the public API. These internally used statistics have non-standard definitions. The classes remain, but now have package scope. Fixes MATH-694. | psteitz | |

Added support for population variance in StatUtils, SummaryStatistics and DescriptiveStatistics and clarified javadoc to make it clear that 'variance' means sample variance. Fixes MATH-693. | psteitz | |

Fixed BigFraction percentage method which did not work at all. Fixes MATH-709. | luc | |

Added interface and abstract class for supporting optimizers classes that can take simple constraints into account. Fixes MATH-697. | erans | |

Fixed a bad interaction between step handlers and event handlers in ODE integrators. Thanks to MATH-706. | luc | |

Added array constructor and getter for Vector2D and Vector3D. Thanks to Jan Kotek. | luc | |

Added applyTo and applyInverseTo methods in the Rotation class that handle directly arrays instead of Vector3D instances. Thanks to Jan Kotek. | luc | |

Added adapters for simple bound constraints optimization that can be used for all direct optimization methods, including the ones that do not support constraints by themselves. Fixes MATH-196. | luc | |

CMA-ES optimizer input sigma is now consistent with boundaries range units. Fixes MATH-702. | luc | |

Added stable random generator based on Chambers-Mallows-Stuck method. Fixes MATH-462. Thanks to Pavel Ryzhof. | psteitz | |

Changed the default seed used for RandomDataImpl, AbstractWell and MersenneTwister PRNGs to add the system identity hash code of the instance to the current system time, so generators initialized with default seeds within system clock resolution will generate different sequences. Changed the default non-secure generator used by RandomDataImpl to Well19937c. Fixes MATH-701. | psteitz | |

Fixed an event resetting issue in ODE. Fixes MATH-695. | luc | |

Default implementation for "addToEntry" and "multiplyEntry" in "AbstractRealMatrix". Fixes MATH-696. | erans | |

Method "addToEntry" in "RealVector". Fixes MATH-685. | erans | |

Replaced temporary matrices and entry mutators with double[][] arrays to speed computation in loops within QRDecomposition, Bi- and TriDiagonalTransformer implementations. Fixes MATH-612. Thanks to Christopher Nix. | psteitz | |

Fixed an integer overflow in OpenMapRealMatrix. Fixes MATH-679. Thanks to Christopher Berner. | luc | |

"FastMath": Use constant fields instead of recomputing them at method call. Fixes MATH-688. | erans | |

Added Jacobi polynomials. Fixes MATH-687. Thanks to Romain di Costanzo. | luc | |

Added "shift" method to compute the coefficients of a new polynomial whose values are the same as those of another polynomial but computed at a shifted point. Fixes MATH-683. Thanks to Romain di Costanzo. | erans | |

Faster "multiply" method in "Array2DRowRealMatrix". Code inspired from the Jama project. Fixes MATH-676. | erans | |

Replaced package.html with package-info.java for package documentation. Fixes MATH-445. | luc | |

Added a getRuntimeClass method to the Field interface allowing to use a complete hierarchy of fields sharing a common interface. Fixes MATH-284. Thanks to Klaus Hartlage. | luc | |

The last remaining uses of OptimizationException have been replaced by unchecked exceptions (UnboundSolutionException, NoFeasibleSolutionException, MaxCountExceededException ...) Fixes MATH-457. | luc | |

The checked ConvergenceException has been replaced by an unchecked ConvergenceException. Fixes MATH-487. | luc | |

ODE step interpolation with Jacobians is now fully merged with classical step interpolation. Fixes MATH-381. Thanks to Pascal Parraud. | luc | |

Completely revamped the computation of Jacobians in ODE. This computation is now included in the mainstream class hierarchy, not in a separate package anymore, and it allows adding other types of equations to a main ODE, not only variational equations for Jacobians computation. Fixes MATH-380. Thanks to Pascal Parraud. | luc | |

SimpleRegression implements UpdatingMultipleLinearRegression interface. Fixes MATH-607. | gregs | |

Added isMonotone methods in MathUtils. Optimized checkOrder method. Fixes MATH-675. | gregs | |

In class "AbstractLeastSquaresOptimizer": Allow to specify a singularity threshold in call to "getCovariances" method. Fixes MATH-664. | erans | |

Added the ability to suppress the estimation of the intercept in SimpleRegression. Fixes MATH-649. | gregs | |

Dead code in FastMath.pow(double, double) and some improvement in test coverage. Fixes MATH-658. Thanks to Yannick TANGUY. | sebb | |

Removed "getData()" method from "RealVector" as it was redundant with "toArray()". Fixes MATH-663. | erans | |

Removed completely MathUserException. Fixes MATH-195. | luc | |

Use the refactored exceptions framework for ODE. Fixes MATH-488. | luc | |

Added a getter to allow retrieving the exception related to an exception context provider. | luc | |

Added erf(double,double) to Erf and used this to improve tail probability accuracy in NormalDistributionImpl. Fixes MATH-364. Thanks to Christian Winter. | psteitz | |

Enabled reseeding of the random generators used by EmpiricalDistributionImpl and ValueServer. Modified ValueServer to pass its RandomData instance to the EmpiricalDistributionImpl that it creates when used in DIGEST_MODE, so reseeding ValueServer works as expected. Fixes MATH-654. | psteitz | |

Renamed "AbstractRealVector" to "RealVector". The interface was removed in favour of its unique (abstract) implementation. Also removed several methods with double[] arguments from AbstractRealVector. Fixes MATH-653. | erans | |

Unmodifiable view of a "RealVector". Fixes MATH-646. Thanks to Sébastien Brisard. | erans | |

Refactored integration API for consistency with solvers API. Now the main convergence parameters are set in the constructor and remain fixed. Fixes MATH-501. | luc | |

Added a maximal number of function evaluations to the integration method, similar to what is done in the solvers API. Fixes MATH-464. | luc | |

Added storeless covariance implementation. Fixes MATH-449. Thanks to Patrick Meyer. | psteitz | |

Eliminated extraneous constructor from SimpleRegression. Fixes MATH-648. | psteitz | |

Eliminated pluggability of ChiSquaredDistribution used by ChiSquaredDistributionTest. Fixes MATH-506. | psteitz | |

Made RandomGenerator configurable and reseedable in EmpiricalDistributionImpl. Fixes MATH-634. | psteitz | |

Added a 3D SubLine class. Fixes MATH-593. | luc | |

Fixed exceptions generated by "ebeMultiply" and "ebeDivide" in "OpenMapRealVector". Fixes MATH-645. | erans | |

In "SingularValueDecompositionImpl", added accessor for the inverse of the condition number. Fixes MATH-602. Thanks to Greg Serijevski. | erans | |

Made pseudo-inverse consistent with rank computation in SingularValueDecompositionImpl. Fixes MATH-601. Thanks to Chris Nix and Greg Serijevski. | psteitz | |

Added methods to solve upper and lower triangular systems to MatrixUtils. Fixes MATH-624. Thanks to Greg Sterijevski. | psteitz | |

Improved performance of nextInt(int) in BitsStreamGenerator. Fixes MATH-642. | psteitz | |

Fixed a wrong detection of rotation axis versus vectors plane in Rotation constructor using two vectors pairs. Fixes MATH-639. | luc | |

Added a few linearCombination utility methods in MathUtils to compute accurately linear combinations a1.b1 + a2.b2 + ... + an.bn taking great care to compensate for cancellation effects. This both improves and simplify several methods in euclidean geometry classes, including linear constructors, dot product and cross product. | luc | |

Fixed bugs in AbstractRandomGenerator nextInt() and nextLong() default implementations. Prior to the fix for this issue, these methods generated only positive values. Fixes MATH-640. | psteitz | |

Simple benchmark utility (new class "PerfTestUtils" added to test sources in src/test). Fixes MATH-637. | erans | |

Added a solver for Dfp-based (i.e. high accuracy) functions. Fixes MATH-636. | luc | |

Added a Brent-like solver that has higher (user specified) order and does bracket selection on the result: BracketingNthOrderBrentSolver. Fixes MATH-635. | luc | |

Added a few shortcut methods and predicates to Dfp (abs, isZero, negativeOrNull, strictlyNegative, positiveOrNull, strictlyPositive). | luc | |

"AbstractRealMatrix" inherits from "RealLinearOperator". Fixes MATH-633. Thanks to Sébastien Brisard. | erans | |

Linear combination of vectors: "RealVector" interface updated, implemented in "AbstractRealVector" and "ArrayRealVector". Fixes MATH-613. Thanks to Sébastien Brisard. | erans | |

Slightly more efficient implementation of basic operations in "ArrayRealVector". Fixes MATH-623. Thanks to Arne Plöse. | erans | |

Overloaded methods (add, subtract, multiply, divide) to take a "double" parameter (as a complex number with zero imaginary part). Code and Javadoc cleanup. Added "valueOf" methods. Fixes MATH-577. Thanks to Arne Plöse. | erans | |

Implemented faster generation of random gamma distributed values with algorithm from Ahrens and Dieter (1972) for shape < 1 and Marsaglia and Tsang (2001) otherwise. Fixes MATH-585. | mikl | |

Allow discrete events to be detected by ODE solvers also at step start. Fixes MATH-605. Thanks to Dennis Hendriks. | luc | |

Rewritten SVD decomposition based on JAMA code. Fixes MATH-327,MATH-383,MATH-465,MATH-583,MATH-611. Thanks to Christopher Nix. | luc | |

Complex add javadoc says that if either addend has NaN parts, the result should be Complex.NaN. Prior to the fix for this issue, NaNs were propagated only in real and imaginary parts individually. Fixes MATH-618. Thanks to Arne Plose. | psteitz | |

Framework for iterative linear solvers. Fixes MATH-581. Thanks to Sébastien Brisard. | erans | |

Improved efficiency in RandomDataImpl, LaguerreSolver, FastMath and OutlineExtractor by moving conditional code into blocks where it is needed. Fixes MATH-609. Thanks to Dave Brosius. | psteitz | |

Prevent step normalizer to output twice the last point in MULTIPLES mode. Fixes MATH-603. Thanks to Dennis Hendriks. | luc | |

Removed the requiresDenseOutput method from the StepHandler interface. Now integrators always consider dense output is required and set up the appropriate state interpolators, so step handlers can rely on them. Fixes MATH-596,MATH-604. | luc | |

Modified "SecantSolver" to comply with the original algorithm. Added several secant-based solvers. Added a way to select the side of the root with bracketing solvers. Fixes MATH-599. Thanks to Dennis Hendriks. | erans | |

Fixed javadoc for ODEIntegrator interface Fixes MATH-600. | luc | |

Extended StepNormalizer with normalization mode and bounds settings. Fixes MATH-595. Thanks to Dennis Hendriks. | luc | |

Implemented faster generation of random exponential distributed values with algorithm from Ahrens and Dieter (1972): Computer methods for sampling from the exponential and normal distributions. Fixes MATH-597. | mikl | |

K-means++ clustering can now run multiple trials Fixes MATH-548. | luc | |

Added a way to compute sub-lines intersections, considering sub-lines either as open sets or closed sets Fixes MATH-591. | luc | |

Added a way to build a sub-line from its endpoints, and to retrieve the endpoints from a sub-line Fixes MATH-592. | luc | |

Javadoc fixes in ODE. Fixes MATH-594. Thanks to Dennis Hendriks. | luc | |

Added a way to specify a custom root solver to find events in ODE integration. Fixes MATH-586. Thanks to Dennis Hendriks. | luc | |

Fixed error in javadoc describing Integer distribution inverse cumulative probability API. Fixes MATH-540. | psteitz | |

Fixed error in javadoc describing the behavior of the Percentile algorithm for small percentiles in small datasets. Fixes MATH-582. Thanks to Christopher Nix. | psteitz | |

New "filter" package. Initial implementation of Kalman filter. Fixes MATH-485. Thanks to Thomas Neidhart. | erans | |

Improved k-means++ clustering performances and initial cluster center choice. Fixes MATH-584. Thanks to Randall Scarberry. | luc | |

Fixed tricube function implementation in Loess interpolator. Fixes MATH-504. Thanks to X. B.. | luc | |

Fixed documentation of statistics examples. Fixes MATH-568. Thanks to Christoph M. Friedrich. | luc | |

Improved documentation of general optimization with a thorough example. Fixes MATH-507. Thanks to Ole Ersoy. | luc | |

Replaced NullPointerException by NullArgumentException. Fixes MATH-403. | luc | |

Added a consistent classes hierarchy for Euclidean spaces in dimension 1, 2 and 3. | luc | |

Improved javadoc for FastMath explaining the overhead at class loading and the targeted use cases. Fixes MATH-579. | luc | |

Allow outer product of vectors of different sizes. Fixes MATH-574. | erans | |

A complete generic implementation of Binary Space Partitioning Trees (BSP trees) has been added. A few specializations of this implementation are also provided for 1D, 2D and 3D Euclidean geometry. This allows support for arbitrary intervals sets (1D), polygons sets (2D) and polyhedrons sets (3D) with all sets operations (union, intersection, symmetric difference, difference, complement), with predicates (point inside/outside/on boundary, emptiness, other region contained), with geometrical computation (barycenter, size, boundary size) and with conversions from and to boundary representation. Fixes MATH-576. | luc | |

Avoid some array copying in add and subtract ArrayFieldVector. Fixes MATH-573. | luc | |

Fixed an unused constructor parameter in ArrayFieldVector. Fixes MATH-572. | luc | |

Created an "ExceptionContext" class: It provides the customization feature of "MathRuntimeException" without imposing a singly rooted hierarchy of the Comons Math exceptions. Thus, those exceptions now inherit from their Java standard counterparts (e.g. "MathIllegalArgumentException" inherits from "IllegalArgumentException"). Fixes MATH-566. | erans | |

Fixed conversion problems to/from 0 in Decimal Floating Point (Dfp) class. Fixes MATH-567. Thanks to Michel. | luc | |

Fixed initialization of multistep ODE integrators. Relying on the interpolation model of the starter integrator inside only one step was wrong. The model may have a too low order to compute high degrees derivatives in the Nordsieck vector. Now we use several steps and use only grid points instead of interpolated points. | luc | |

Added solve methods using double[][] to linear algebra decomposition solvers. Fixes MATH-564. | luc | |

Added an interpolator adapter for data with known period. Fixes MATH-562. | erans | |

Added a "rectangular" Cholesky decomposition for positive semidefinite matrices. Fixes MATH-541. | luc | |

Added setters allowing to change the step size control parameters of adaptive step size ODE integrators. Fixes MATH-563. | luc | |

Added a compareTo method to MathUtils that uses a number of ulps as a tolerance error, and works well on all numbers, including normals, subnormals, signed zeroes, infinities and NaNs. Fixes MATH-557. | luc | |

Fixed two errors in simplex solver when entries are close together or when variables are not restricted to non-negative. Fixes MATH-434. Thanks to Thomas Neidhart. | luc | |

Improved robustness of k-means++ algorithm, by tracking changes in points assignments to clusters. Fixes MATH-547. Thanks to Thomas Neidhart. | luc | |

Changed MathUtils.round(double,int,int) to propagate rather than wrap runtime exceptions. Instead of MathRuntimeException, this method now throws IllegalArgumentException or ArithmeticException under the conditions specified in the javadoc. Fixes MATH-555. | psteitz | |

Reduced cancellation errors in Vector3D.crossProduct Fixes MATH-554. | luc | |

Fixed bug in "MultidimensionalCounter". Fixes MATH-552. Thanks to James Bence. | erans | |

All unit tests have been converted to Junit 4. They need at least Junit 4.5 to run (the ant and maven build systems are currently set to use Junit 4.8.2) Fixes MATH-423. Thanks to Gilles Sadowski. | luc | |

Removed the ConvergingAlgorithm interface and ConvergingAlgorithmImpl class Fixes MATH-500. Thanks to Gilles Sadowski. | luc | |

Added a consistency check for number of points with respect to the number of clusters in Kmeans++ clustering Fixes MATH-436. Thanks to Thomas Neidhart. | luc | |

Added two sided Kolmogorov-Smirnov distribution using modified Marsaglia et al. (2003) implementation and quick decisions for certain parameter areas according to Simard et al. (2011). Fixes MATH-437. | mikl | |

Added "power" method in "RealMatrix" and "FieldMatrix<T>" interfaces and their default implementations in "AbstractRealMatrix" and "AbstractFieldMatrix". Fixes MATH-435. | mikl | |

Added "cosine" method in "RealVector" interface and default implementation in "AbstractRealVector". Fixes MATH-545. | erans | |

Fixed bug in "KMeansPlusPlusClusterer". Fixes MATH-546. Thanks to Nate Paymer. | erans | |

All exceptions defined in Commons Math provide a context and a compound message list. Fixes MATH-542. | erans | |

Refactored "PolynomialFitter" (in package "optimization.fitting"). Added parametric function in "PolynomialFunction" (in package "analysis.polynomials"). Fixes MATH-534. | erans | |

Removed "HarmonicFunction" (in package "optimization.fitting"); superseded by class "HarmonicOscillator" (in package "analysis.function"). Fixes MATH-518. | erans | |

Refactored "HarmonicFitter" (in package "optimization.fitting"). "HarmonicCoefficientsGuesser" removed. Fixes MATH-517. | erans | |

Removed "GaussianFunction" and "GaussianDerivativeFunction" (in package "optimization.fitting"); functionality moved to class "Gaussian" (in package "analysis.function"). Fixes MATH-516. | erans | |

Removed "ParametricGaussianFunction" (in package "optimization.fitting"); functionality moved to class "Gaussian" (in package "analysis.function"). Fixes MATH-514. | erans | |

Refactored "GaussianFitter" (in package "optimization.fitting"). The class now really fits a Gaussian function (whereas previously it was fitting the sum of a constant and a Gaussian). Fixes MATH-512. Thanks to Ole Ersoy. | erans | |

Implementation of the CMA-ES optimization algorithm. Fixes MATH-442. Thanks to Dietmar Wolz. | erans | |

The interface "ParametricRealFunction" (in package "optimization.fitting") has been renamed to "ParametricUnivariateRealFunction" and moved to package "analysis". Fixes MATH-513. | erans | |

TestUtils is thread-hostile. Remove getters and setters, and make static variables final. Fixes MATH-505. | sebb | |

Create FastMath copySign methods Fixes MATH-496. | sebb | |

FastMath atan2 does not agree with StrictMath for special cases Fixes MATH-494. | sebb | |

Removed checked "MaxIterationsExceededException" (superseded by "MaxCountExceededException" from package "exception"). Fixes MATH-492. | erans | |

Removed checked "DimensionMismatchException". Replaced all occurrences by its equivalent from package "exception". Fixes MATH-491. | erans | |

FastMath acos fails when input abs value is less than about 5.7851920321187236E-300 - returns NaN Fixes MATH-489. | sebb | |

FastMath toRadian and toDegree don't handle large double numbers well Fixes MATH-486. | sebb | |

FastMath does not handle all special cases correctly Fixes MATH-483. | sebb | |

Fix ulp(Infinity) to return Infinity rather than NaN Fixes MATH-480. | sebb | |

FastMath.signum(-0.0) does not agree with Math.signum(-0.0) Fixes MATH-479. | sebb | |

FastMath is not an exact replacement for StrictMath (partially fixed) Add signum(float), ulp(float) Fixes MATH-478. | sebb | |

FastMath.max(50.0f, -50.0f) => -50.0f; should be +50.0f Fixed FastMath.max(float, float) so it returns correct value. Fixes MATH-482. | sebb | |

MATH-491 MathUtils.equals(double, double) does not work properly for floats - add equivalent (float, float) methods and basic tests Fixes MATH-471. | sebb | |

Removed "MathException" from the "throws" clause of the "interpolate" method of the interpolators interfaces (package "analysis.interpolation"). Fixes MATH-458. | erans | |

In order to comply with the new runtime exceptions policy, the classes "RealVectorFormat", "ComplexFormat", "Vector3DFormat" and "CompositeFormat" do not inherit anymore from the Java standard "Format" class. Failed parsing will result in the throwing of a "MathParseException". "CompositeFormat" is now a utility class ("private" constructor). Fixes MATH-461. | erans | |

By policy, all Commons Math exceptions must inherit from class "MathRuntimeException". Fixes MATH-447. | erans | |

For optimizers (package "optimization"), the number of allowed function evaluations is passed as a parameter to the "optimize" method. Fixes MATH-454. | erans | |

For solvers (package "analysis.solvers"), the number of allowed function evaluations is passed as a parameter to the "solve" method. Fixes MATH-451. | erans | |

Created a "MathRuntimeException" to serve as a base class for exception types that need to wrap another (lower-level) exception. Fixes MATH-447. | erans | |

Replaced "ComposableFunction" and "BinaryFunction" (in package "analysis") by a set of utilities in the new class "FunctionUtils" together with independent function objects in the new "analysis.function" package. Removed redundant "mapXxx" and "mapXxxToSelf" methods in "RealVector" and "AbstractRealVector" (in package "linear"). Fixes MATH-430. | erans | |

Refactoring of the "analysis.solvers" package. Fixes MATH-439. | erans | |

Removed the ode.jacobians package. Fixes MATH-380. | luc | |

Removed classes "FunctionEvaluationException", "MatrixVisitorException" and "DerivativeException" (superseded by the new "MathUserException"). Fixes MATH-440. | erans | |

Created a generic "Pair" class to replace the "AbstractMap.SimpleEntry" that is only available in Java 6 and later. Fixes MATH-432. | erans | |

Class "DirectSearchOptimizer" (and subclasses "NelderMead" and "MultiDirectional") was refactored into new classes: "SimplexOptimizer" and "AbstractSimplex" (and subclasses "NelderMeadSimplex" and "MultiDirectionalSimplex"). The old classes were deprecated and removed. Fixes MATH-428. | erans | |

Created "MatrixDimensionMismatchException" to replace "InvalidMatrixException" (when the latter is used to signal that matrices are not compatible for some operation). Replaced "MatrixIndexException" with "OutOfRangeException" (when the former is used to signal a row or column dimension mismatch). Fixes MATH-425. | erans | |

Made "sample" methods part of the "IntegerDistribution" and "ContinuousDistribution" interfaces. Fixes MATH-310. | erans | |

All distribution classes (in package "distribution") are immutable. Fixes MATH-349. | erans | |

Created an unchecked "FunctionEvaluationException". Modified the "UnivariateRealFunction" interface: Removed the checked "FunctionEvaluationException" from the signature of the "value" method. Fixes MATH-195. | erans | |

Modified semantics: "equals" methods now consider that NaNs are not equal (compliant with IEEE754). Also, two adjacent floating point numbers are considered equal (this is consistent with the fact that all real numbers between them can be represented by either of the two). One consequence of that is that "equals" is not transitive. Fixes MATH-370. | erans | |

Removed methods referring to the concept of "iteration". Removed interface methods to access the number of evaluations of the gradient and Jacobian. Added new "Incrementor" utility to be used as a bounded counter for objective function evaluations. Removed all references to "OptimizationException" (replaced by "ConvergenceException"). Fixes MATH-397. | erans | |

Modified "AbstractUnivariateRealOptimizer" to make it more similar to "BaseAbstractScalarOptimizer". Added utility methods in "ConvergingAlgorithmImpl". Fixes MATH-397. | erans | |

Refactoring of some classes in package "optimization.general" to remove code duplication and to allow the implementation of optimization algorithms that do not use derivatives. Created interface "BaseMultivariateRealOptimizer". Created classes "BaseAbstractScalarOptimizer" and "AbstractScalarOptimizer". "MultivariateRealOptimizer" and "DifferentiableMultivariateRealOptimizer" both extend "BaseMultivariateRealOptimizer". "AbstractScalarOptimizer" extends "BaseAbstractScalarOptimizer" and "AbstractScalarDifferentiableOptimizer" inherits from "AbstractScalarOptimizer". Fixes MATH-389. | erans |

Type | Changes | By |
---|---|---|

FastMath is not an exact replacement for StrictMath (partially fixed) added scalb(double, int), scalb(float, int) Fixes MATH-498. | luc | |

FastMath is not an exact replacement for StrictMath (partially fixed) added hypot(double, double), nextAfter(double, double) and nextAfter(float,double) (beware of the strange double second argument) so that they handle special values in the way as StrictMath Fixes MATH-478. | luc | |

FastMath is not an exact replacement for StrictMath (partially fixed) added getExponent(double) and getExponent(float) Fixes MATH-497. | luc | |

FastMath is not an exact replacement for StrictMath (partially fixed) Add copySign(double), copySign(float) Fixes MATH-496. | sebb | |

separate discrete event detection from adaptive step size handling in ODE solvers, thus improving robustness, maintainability and speed Fixes MATH-484. | luc | |

Fixed an awkward statement that triggered a false positive warning. Fixes MATH-467. | luc | |

Added complementary error function, erfc. Fixes MATH-364. Thanks to Christian Winter. | psteitz | |

Modified erf (and erfc) to return extreme values for x with abs(x) > 40. For these arguments, the true value is indistinguishable from an extrema as a double. Fixes MATH-456. | psteitz | |

Added characteristic support to distributions, including methods to return numerical estimates of the mean and variance and upper and lower bounds of support. In version 2.2, methods returning distribution characteristics have been added only to the implementation classes. In version 3, supporting methods have been added to the abstract base classes and distribution interfaces. Fixes MATH-385. | mikkel | |

Added a constructor and addValues(double[]) methods allowing DescriptiveStatistics to be initialized with values from a double[] array. Similarly enhanced ResizeableDoubleArray. Fixes MATH-384. | mikkel | |

Added a getUniqueCount() method to Frequency to return the number of unique values included in the frequency table. Fixes MATH-448. Thanks to Patrick Meyer. | psteitz | |

Modified NormalDistributionImpl.cumulativeProbability to return 0 or 1, respectively for values more than 40 standard deviations from the mean. For these values, the actual probability is indistinguishable from 0 or 1 as a double. Top coding improves performance for extreme values and prevents convergence exceptions. Fixes MATH-414. | psteitz | |

Added toString() override to StatisticalSummaryValues. Fixes MATH-420. | psteitz | |

Deprecated the whole ode.jacobians package. It is clumsy and difficult to use. It will be replaced by a completely rewritten implementation in 3.0, which will be more tightly bound to the top level ode package Fixes MATH-380. | luc | |

Added a normalization feature to transform samples so they have zero mean and unit standard deviation Fixes MATH-426. Thanks to Erik van Ingen. | luc | |

Created "MathUserException" class to convey cause of failure between layers of user code separated by a layer of Commons Math code. Deprecated classes "FunctionEvaluationException", "MatrixVisitorException" and "DerivativeException". Fixes MATH-440. | erans | |

Fixed k-means++ to add several strategies to deal with empty clusters that may appear during iterations. Fixes MATH-429. | luc | |

Improved Percentile performance by using a selection algorithm instead of a complete sort, and by allowing caching data array and pivots when several different percentiles are desired. Fixes MATH-417. | luc | |

Fixed an error preventing zero length vectors to be built by some constructors. Fixes MATH-391. | luc | |

Fixed an error preventing ODE solvers to be restarted after they have been stopped by a discrete event. Fixes MATH-421. | luc | |

Added new random number generators from the Well Equidistributed Long-period Linear (WELL). Fixes MATH-419. | luc | |

Made intercept / no intercept configurable in multiple regression classes. By default, regression models are estimated with an intercept term. When the "noIntercept" property is set to true, regression models are estimated without intercepts. Fixes MATH-409. | psteitz | |

Fixed lost cause in MathRuntimeException.createInternalError. Note that the message is still the default message for internal errors asking to report a bug to Commons Math JIRA tracker. In order to retrieve the message from the root cause, one has to get the cause itself by getCause(). Fixes MATH-415. | luc | |

Modified multiple regression newSample methods to ensure that by default in all cases, regression models are estimated with intercept terms. Prior to the fix for this issue, newXSampleData(double[][]), newSampleData(double[], double[][]) and newSampleData(double[], double[][], double[][]) all required columns of "1's" to be inserted into the x[][] arrays to create a model with an intercept term; while newSampleData(double[], int, int) created a model including an intercept term without requiring the unitary column. All methods have been changed to eliminate the need for users to add unitary columns to specify regression models. Users of OLSMultipleLinearRegression or GLSMultipleLinearRegression versions 2.0 or 2.1 should either verify that their code either does not use the first set of data loading methods above or set the noIntercept property on estimated models to get the previous behavior. Fixes MATH-411. | psteitz | |

Added the dfp library providing arbitrary precision floating point computation in the spirit of IEEE 854-1987 (not exactly as it uses base 1000 instead of base 10). In addition to finite numbers, infinities and NaNs are available (but there are no subnormals). All IEEE 854-1987 rounding modes and signaling flags are supported. The available operations are +, -, *, / and the available functions are sqrt, sin, cos, tan, asin, acos, atan, exp, log. Fixes MATH-412. Thanks to Bill Rossi. | luc | |

Added faster and more accurate version of traditional mathematical functions in a FastMath class intended to be a drop-in replacement for java.util.Math at source-level. Some functions still directly delegates to Math but this will improve with time. Some functions like exp may be twice as fast (even 3 times faster on some processors). Sine, cosine or power functions show typical speedups of 1.5 times faster or more. Fixes MATH-375. Thanks to Bill Rossi. | luc | |

Added R-squared and adjusted R-squared statistics to OLSMultipleLinearRegression. Fixes MATH-386. | psteitz | |

Corrected the formula used for Y variance returned by calculateYVariance and associated methods in multiple regression classes (AbstractMultipleLinearRegression, OLSMultipleLinearRegression, GLSMultipleLinearRegression). These methods previously returned estimates of the variance in the model error term. New "calulateErrorVariance" methods have been added to compute what was previously returned by calculateYVariance. Fixes MATH-392. Thanks to Mark Devaney. | psteitz | |

Bug fixed in Levenberg-Marquardt (handling of weights). Fixes MATH-406. | dimpbx | |

Bug fixed in Levenberg-Marquardt (consistency of current). Fixes MATH-405. | dimpbx | |

Bug fixed in chi-square computation in AbstractLeastSquaresOptimizer. Fixes MATH-377. | dimpbx | |

Added support for Gaussian curve fitting. Fixes MATH-400. Thanks to J. Lewis Muir. | luc | |

Fixed several bugs in "BrentOptimizer". Fixes MATH-395. | erans | |

Fixed inconsistency in return values in "MultiStartUnivariateRealOptimizer". Fixes MATH-393. | erans | |

Added a feature allowing error estimation to be computed only on a subset of Ordinary Differential Equations, considered as the main set, the remaining equations being considered only as an extension set that should not influence the ODE integration algorithm Fixes MATH-388. | luc | |

Fixed bug in precondition check (method "setMicrosphereElements"). Fixes MATH-382. | erans | |

Created "MultidimensionalCounter" class. Fixes MATH-379. | erans | |

Created package "exception" to contain the new exceptions hierarchy. Created package "exception.util": utilities for the exception classes (e.g. managing the localization of error messages). Default policy for dealing with invalid null references: raise a "NullArgumentException" (subclass of "IllegalArgumentException"). Fixes MATH-361. | erans | |

Implementation of linear interpolation. Fixes MATH-378. Thanks to Matthew Rowles. | erans | |

Improved localization of error messages. Fixes MATH-361. | luc | |

Allow multiple optimizations with a default simplex. Fixes MATH-376. | erans | |

Added new "equalsIncludingNaN" methods that have the same semantics as the old "equals" methods. These are deprecated, and their semantics will be modified (in the next major release) such that NaNs are not considered equal (to be more compliant with IEEE754). Fixes MATH-370. | erans | |

Added a setQRRankingThreshold method to Levenberg-Marquardt optimizer to improve robustness of rank determination. Fixes MATH-352. | luc | |

Added random data generation methods to RandomDataImpl for the remaining distributions in the distributions package. Added a generic nextInversionDeviate method that takes a discrete or continuous distribution as argument and generates a random deviate from the distribution. Also added sampling methods based on the implementations in RandomDataImpl to distributions. Fixes MATH-310. | psteitz | |

Fixed Levenberg-Marquardt optimizer that did not use the vectorial convergence checker. Now this optimizer can use either the general vectorial convergence checker or its own specialized convergence settings. Fixes MATH-362. | luc | |

Fixed loss of significance error in PersonsCorrelation p-value computation causing p-values smaller than the machine epsilon (~1E-16) to be reported as 0. Fixes MATH-371. Thanks to Kevin Childs. | psteitz | |

Fix NullPointerException in BisectionSolver.solve(f, min, max, initial) Fixes MATH-369. Thanks to Sasun Pundev. | luc | |

Fix spelling of getSparcity [sic] method of OpenMapRealVector Fixes MATH-368. | billbarker | |

Fix problem with the default sparseIterator when a RealVector has exactly one non-zero entry Fixes MATH-367. Thanks to Albert Huang. | billbarker | |

Implementation of tricubic interpolation. Fixes MATH-366. | erans | |

Deprecated SmoothingBicubicSplineInterpolator and SmoothingBicubicSplineInterpolatorTest. Added BicubicSplineInterpolator and BicubicSplineInterpolatorTest. Added SmoothingPolynomialBicubicSplineInterpolator and SmoothingPolynomialBicubicSplineInterpolatorTest. Added method to clear the list of observations in PolynomialFitter. Fixes MATH-365. | erans |

Type | Changes | By |
---|---|---|

Fix use of wrong variable in SmoothingBicubicSplineInterpolatorTest.testPreconditions() Fixes MATH-360. | sebb | |

Added method to clear the list of observations in CurveFitter. Fixes MATH-356. | erans | |

Implementation of bicubic interpolation. Fixes MATH-357. | erans | |

Added density functions to remaining continuous distributions (F, T, Weibull, Cauchy). As of Math 2.1, all continuous distributions implement density functions. The HasDensity interface has been deprecated and in version 3.0, density(double) will be added to the ContinuousDistribution interface. Fixes MATH-332. Thanks to Mikkel Meyer Andersen. | psteitz | |

Changed equals() methods to use instanceof check rather than catching ClassCastException; this also allows some null checks to be omitted. Fixes MATH-337. | sebb | |

Removed unnecessary null checks in equals methods. Fixes MATH-336. | sebb | |

Fraction.hashCode() implementation was not fully consistent with Fraction.equals(). Changed hashCode() to use fields directly to agree with equals(). Fixes MATH-335. | sebb | |

Resolved multiple problems leading to inaccuracy and/or failure to compute Normal, ChiSquare and Poisson probabilities, Erf and Gamma functions. Made Brent solver absolute accuracy configurable for all continuous distributions. Fixes MATH-282. | psteitz | |

Fixed too stringent interval check in Brent solver: initial guess is now allowed to be at either interval end Fixes MATH-347. | luc | |

Added a way to compute both the final state in an Initial Value Problem (IVP) for Ordinary Differential Equations (ODE) and its derivatives with respect to initial state and with respect to some problem parameters. This allows wrapping ODE solvers into optimization or root finding algorithms, which in turn can be used to solve Boundary Value Problems (BVP). There are no implementations (yet) of BVP solvers in the library. | luc | |

Fixed an error in events handling in ODE solvers. In some rare cases, events occurring close to a step start were handled without truncating the step, making them appear as is they occurred close to the step end Fixes MATH-358. | luc | |

Fixed a problem with getInterpolatedDerivatives returning zero derivatives when an ODE step handler is configured to not use interpolation. It now returns a constant but non-zero value consistent with at least one point inside the step | luc | |

Fixed wrong return values when enpoints are roots in Brent solver with a user provided initial guess Fixes MATH-344. | luc | |

Fixed a missing bracketing check of initial interval in Brent solver. Fixes MATH-343. | luc | |

In SVD, the matrices passed to EigenDecomposition are now symmetric by construction (rather than simply by definition). In EigenDecomposition, once the tridiagonal form is obtained, the non-significant elements are set to 0. Fixes MATH-342. | dimpbx | |

A EigenDecompositionImpl simplified makes it possible to compute the SVD of a singular matrix (with the right number of elements in the diagonal matrix) or a matrix with singular value(s) of multiplicity greater than 1. Fixes MATH-333. | dimpbx | |

Added SemiVariance statistic. Fixes MATH-323. Thanks to Larry Diamond. | psteitz | |

Added a warning in the getCoefficients method documentation for PolynomialFunctionLagrangeForm. Computation may be ill-conditioned so this method should be used with care. Fixes MATH-341. | luc | |

Fixed an error in BigFraction multiplication for large numerators that don't fit in a primitive int. Fixes MATH-340. | luc | |

Fixed a spurious exception in EigenDecompositionImpl when a 3x3 block had two identical eigenvalues. | luc | |

Added min/max getters for real vectors (not yet in the RealVector interface for compatibility purposes, but in the AbstractRealVector abstract class). Fixes MATH-334. | luc | |

Fixed automatic step initialization in embedded Runge-Kutta integrators. The relative tolerance setting was never used, only the absolute tolerance was used. Fixes MATH-338. Thanks to Vincent Morand. | luc | |

Fixed regression in Frequency.getPct(Object) introduced in 2.0. Cumulative percent was being returned for Object arguments in place of percent. Fixes MATH-329. | psteitz | |

Singular Value Decomposition now computes either the compact SVD (using only positive singular values) or truncated SVD (using a user-specified maximal number of singular values). Fixes MATH-321. | luc | |

Fixed Singular Value Decomposition solving of singular systems. Fixes MATH-320. | luc | |

Added MathUtils methods to compute gcd and lcm for long arguments. Fixes MATH-239. Thanks to Christian Semrau. | psteitz | |

Added support for weighted univariate statistics. Fixes MATH-287. Thanks to Matthew Rowles. | psteitz | |

Fixed a wrong implementation of the Linf norm in vectors. Fixes MATH-326. Thanks to Jake Mannix. | luc | |

Fixed a convergence discrepancy with respect to theory in Gragg-Bulirsch-Stoer integrator. Fixes MATH-324. Thanks to Vincent Morand. | luc | |

Fixed a wrong dimension check in SVD solver. Thanks to Dimitri Pourbaix. | luc | |

Added composition features for real functions. Fixes MATH-313. Thanks to Jake Mannix. | luc | |

Added mapping and iteration methods to vectors. Provided a default implementation for the numerous simple methods in the RealVectorInterface. Fixes MATH-312. Thanks to Jake Mannix. | luc | |

Fixed an error in handling very close events in ODE integration. Fixes MATH-322. | luc | |

Fixed an overflow error in MathUtils.distance that was causing KMeansPlusPlusClusterer to fail with a NullPointerException when component distances between points exceeded Integer.MAXVALUE. Fixes MATH-305. Thanks to Erik van Ingen. | psteitz | |

Added generationsEvolved property to GeneticAlgorithm to track the number of generations evolved by the evolve() method before reaching the StoppingCondition. Fixes MATH-315. Thanks to Mikkel Meyer Andersen. | psteitz | |

Fixed an index computation error in eigen decomposition. Once again, kudos to Dimitri for debugging this. Fixes MATH-318. Thanks to Dimitri Pourbaix. | luc | |

Fixed an ArrayIndexOutOfBoundsException in eigen decomposition. Kudos to Dimitri for debugging this, it was really difficult. Fixes MATH-308. Thanks to Dimitri Pourbaix. | luc | |

Fixed parameter test in RandomDataImpl#nextExponential. The method now throws IllegalArgumentException for mean = 0. Fixes MATH-309. Thanks to Mikkel Meyer Andersen. | psteitz | |

Changed probability calculations for Binomial, Poisson, and Hypergeometric distributions to use Catherine Loader's saddle point approximations. Fixes MATH-311. Thanks to Nipun Jawalkar. | brentworden | |

Removed dead code from Complex#divide. Fixes MATH-306. Thanks to Joerg Huber. | psteitz | |

Fixed implementation of RandomDataImpl#nextPoisson by implementing an alternative algorithm for large means. Fixes MATH-294. | psteitz | |

Added support for multidimensional interpolation using the robust microsphere algorithm. Fixes MATH-300. Thanks to Gilles Sadowski. | psteitz | |

Fixed implementation of EmpiricalDistributionImpl#getUpperBounds to match interface contract. Added getGeneratorUpperBounds method to EmpiricalDistributionImpl providing previous behavior. Fixes MATH-298. | psteitz | |

Fixed wrong results on Loess interpolation, also added a way to set weights for smoothing and to ignore zero weights for coefficients computation Fixes MATH-296. Thanks to Eugene Kirpichov. | luc | |

Fixed a OutOfBoundException in simplex solver when some constraints are tight. Fixes MATH-293. Thanks to Benjamin McCann. | luc | |

Fixed misleading number formats in error messages for adaptive stepsize integrators. Fixes MATH-291. Thanks to Sebb. | luc | |

Added support for weighted descriptive statistics. Fixes MATH-287. Thanks to Matthew Rowles. | psteitz | |

Added normalizeArray method to MathUtils. | psteitz | |

Fixed a NullPointerException in simplex solver when no solution is possible and some constraints are negative. Fixes MATH-290. Thanks to Benjamin McCann. | luc | |

Removed an unused argument in a private method in simplex solver. Fixes MATH-289. | luc | |

Fixed an error induced by entries set to 0 in simplex solver. Fixes MATH-288. Thanks to Benjamin McCann. | luc | |

Fixed an error leading the simplex solver to compute the right solution but return another one. Fixes MATH-286. Thanks to Benjamin McCann. | luc | |

Prevent infinite loops in multi-directional direct optimization method when the start point is exactly at the optimal point. Fixes MATH-283. Thanks to Michael Nischt. | luc | |

Prevent possible zero divides on eigenvectors of indefinite matrices Fixes MATH-297. Thanks to Axel Kramer. | billbarker |

Type | Changes | By |
---|---|---|

Fixed an error in RealMatrix javadoc Fixes MATH-281. Thanks to Albert Huang. | luc | |

Added an implementation of the Mersenne twister pseudo random number generator from Makoto Matsumoto and Takuji Nishimura | luc | |

Changed the return type of the various interpolation algorithms to the specific implementation of UnivariateRealFunction each one uses Thanks to Gilles Sadowski. | luc | |

The behavior of the bracket method in UnivariateRealSolverUtils has been changed to return successfully when a tentative bracketing interval has a root exactly at one of its end points. Previously, such intervals triggered an exception. Fixes MATH-280. | luc | |

Added a check for too few rows with respect to the number of predictors in linear regression Fixes MATH-279. Thanks to Michael Bjorkegren. | luc | |

Added a getCovariance method to singular value decomposition Thanks to Dimitri Pourbaix. | luc | |

Added robust locally weighted regression (Loess). Fixes MATH-278. Thanks to Eugene Kirpichov. | luc | |

Added a scalar multiply to the Complex class Fixes MATH-277. Thanks to Mark Anderson. | luc | |

Added curve fitting with a general case and two specific cases (polynomial and harmonic). | luc | |

Optimized Complex isNaN(), isInfinite() by moving computation to constructor. Fixes MATH-276. Thanks to Mark Anderson. | psteitz | |

Added Genetic Algorithm implementation. Fixes MATH-207. Thanks to David Stefka. | psteitz | |

Fixed detection of not positive definite matrices in Cholesky decomposition Fixes MATH-274. | luc | |

Fixed a wrong check for basic variables Fixes MATH-273. Thanks to Benjamin McCann. | luc | |

Fixed a problem when setting some variables (several variables were set instead of only one) Fixes MATH-272. Thanks to Benjamin McCann. | luc | |

Added a way to limit the number of functions evaluations in optimizers (the number of iterations could already be limited) Thanks to Gilles Sadowski. | luc | |

Added digamma function. Fixes MATH-267. Thanks to Ted Dunning. | psteitz | |

Added Spearman's rank correlation (SpearmansCorrelation). Fixes MATH-136. Thanks to John Gant. | psteitz | |

Added support for rank transformations. | psteitz | |

Completed internationalization of all error messages | luc | |

Added a clustering package with an implementation of the k-means++ algorithm Fixes MATH-266. Thanks to Benjamin McCann. | luc | |

Added distance1, distance and distanceInf utility methods for double and int arrays in MathUtils Fixes MATH-265. Thanks to Benjamin McCann. | luc | |

Added an utility equality method between double numbers using tolerance in ulps (Units in Last Position) Fixes MATH-264. Thanks to Gilles Sadowski. | luc | |

Added getNorm1, getNormInf, distance1 and distanceInf to the Vector3D class Fixes MATH-263. | luc | |

Added support for any type of field in linear algebra (FielxMatrix, FieldVector, FieldLUDecomposition) | luc | |

The RealMatrixImpl implementation classes has been renamed Array2DRowRealMatrix to reflect its specificities and for consistency with the new implementations. The previous name is still available but is deprecated | luc | |

Added a block-based storage type for dense matrices improving speed for large dimensions | luc | |

Added AggregateSummaryStatistics class to support aggregation of SummaryStatistics. Thanks to John Bollinger. | psteitz | |

Added general Field and FieldElement interfaces to allow generic algorithms to operate on fields. The library already provides several implementations: Complex, Fraction, BigFraction and BigReal | luc | |

Fixed inconsistent access to multidimensional array in FastFourierTransformer Fixes MATH-257. Thanks to Sebb. | luc | |

Greatly improved multiplication speed for sparse matrices Fixes MATH-248. | luc | |

Fixed threading issues with MathException and MathRuntimeException Fixes MATH-253. Thanks to Sebb. | luc | |

Fixed threading issues with UnivariateRealSolverUtils factory Fixes MATH-254. Thanks to Sebb. | luc | |

Reduced visibility of MessagesResources_fr.contents field to private Fixes MATH-255. Thanks to Sebb. | luc | |

Added Fraction.toString() Fixes MATH-256. | luc | |

Added add/subtract/multiply/divide functions with integer parameters to Fraction | luc | |

Added some utility functions to compute powers with integral types (int, long, BigInteger). | luc | |

Fixed a comparison error when two different fractions evaluate to the same double due to limited precision. Fixes MATH-252. | luc | |

Added a BigFraction class that does not overflow when big numerators or denominators are used. Fixes MATH-251. Thanks to Benjamin Croizet. | luc | |

Added an optimizer for constrained linear problems based on 2-phases standard simplex. Fixes MATH-246. Thanks to Benjamin McCann. | luc | |

Redesigned the optimization framework for a simpler yet more powerful API. Added non-linear conjugate gradient optimizer. Fixes MATH-177. | luc | |

Fixed an error in computing gcd and lcm for some extreme values at integer range boundaries. Fixes MATH-243. Thanks to Christian Semrau. | luc | |

Added a MathUtils method to check equality given some error bounds. Fixes MATH-247. Thanks to Benjamin McCann. | luc | |

Added PearsonsCorrelation class to compute correlation matrices, standard errors and p-values for correlation coefficients. Fixes MATH-114. Thanks to John Gant. | psteitz | |

Added Covariance class to compute variance-covariance matrices in new correlation package. Fixes MATH-114. | psteitz | |

Improved fast Fourier transform efficiency. Fixes MATH-216. Thanks to Cyril Briquet. | luc | |

Added a SparseRealVector class that implements a sparse vector for the RealVector interface. | billbarker | |

Added factory methods to create Chebyshev, Hermite, Laguerre and Legendre polynomials. | luc | |

Added add, subtract, negate, multiply and toString methods to PolynomialFunction. | luc | |

Changed FractionFormat to extend NumberFormat. Fixes MATH-189. | psteitz | |

Forced symmetry in binomialCoefficientLog and added test cases for MathUtils. Fixes MATH-242. Thanks to Christian Semrau. | psteitz | |

Fixed error in binomial coefficient computation. Fixes MATH-241. Thanks to Christian Semrau. | psteitz | |

Added a Legendre-Gauss integrator. | luc | |

Fixed error in factorial computation for 17 <= n <= 20. Fixes MATH-240. Thanks to Christian Semrau. | psteitz | |

Integration algorithms now can have both relative and absolute accuracy settings. | luc | |

Added a new univariate sub-package below the optimization package. Fixes MATH-177. Thanks to Gilles Sadowski. | luc | |

The analysis package has been reorganized with several sub-packages. | luc | |

Fixed an error in gcd computation for large values. Fixes MATH-238. Thanks to Christian Semrau. | luc | |

Added method to walk matrix entries with or without changing them in the visitor design pattern sense. Three different orders can be used, row by row, column by column or optimized order according to internal storage. Optimized order should be preferred when no specific order is needed, because it will be more cache efficient. | luc | |

Added Fast Hadamard Transform. Fixes MATH-215. Thanks to Bernhard Grünewaldt. | luc | |

Added nth root computation for complex numbers. Fixes MATH-236. Thanks to Bernhard Grünewaldt. | luc | |

Added support for sparse matrix. Fixes MATH-230. Thanks to Sujit Pal and Ismael Juma. | luc | |

Added an int/double hash map (OpenIntToDoubleHashMap) with much smaller memory overhead than standard java.util.Map (open addressing and no boxing). Thanks to Ismael Juma. | luc | |

Added support for multi-dimensional Fourier transform. Fixes MATH-152. Thanks to Remi Arntzen. | luc | |

The root solvers and the integrators now take the function to solve as a parameter to the solve/integrate methods, thus allowing to reuse the same solver/integrator for different functions. Fixes MATH-218. | luc | |

Added setter methods for rows and columns in matrices. Fixes MATH-234. | luc | |

Added Frobenius matrix norm. Fixes MATH-232. | luc | |

Added an abstract matrix implementation simplifying extension by users. Fixes MATH-231. | luc | |

Added support for the Zipf distribution. Fixes MATH-178. Thanks to Paul Cowan. | luc | |

Added support for copying statistics. Changes to stats classes include copy constructor, static copy(-,-) and instance copy() methods. Added copy() to UnivariateStatistic and StorelessUnivariateStatistic interfaces. Fixes MATH-212. Thanks to Jason C. HandUber. | psteitz | |

Added a removal feature for observations in descriptive statistics. Fixes MATH-229. Thanks to Cyril Briquet. | luc | |

Added a scalb method in MathUtils. This method is similar to the method with same name added in java.lang.Math as of Java 6. | luc | |

Fixed F distribution inverse CDF computation for small denominator degrees of freedom. Fixes MATH-227. Thanks to Joerg Henning. | brentworden | |

Fixed an error in CorrelatedRandomVectorGenerator leading to a component of the generated vector being constant. Fixes MATH-226. Thanks to Stuart Siegel. | luc | |

Greatly improved QR-decomposition speed using transposed matrices internally. Fixes MATH-223. Thanks to John Mulcahy. | luc | |

Fixed an infinite loop encountered in some backward integration cases for ODE solvers. Thanks to Pascal Parraud. | luc | |

Added beta distribution. Fixes MATH-222. Thanks to Ted Dunning. | luc | |

Added probability density functions computation for distributions for which it is feasible. Fixes MATH-222. Thanks to Ted Dunning. | luc | |

Changed the Complex.equals() method so that it considers +0 and -0 are equal, as required by IEEE-754 standard. Fixes MATH-221. Thanks to Dieter Roth. | luc | |

Added JAMA-like interfaces for eigen/singular problems. The implementation are based on the very quick dqd/dqds algorithms and some parts of the MRRR algorithm. This leads to very fast and accurate solutions. Fixes MATH-220. | luc | |

Added JAMA-like interfaces for decomposition algorithms. These interfaces decompose a matrix as a product of several other matrices with predefined properties and shapes depending on the algorithm. These algorithms allow to solve the equation A * X = B, either for an exact linear solution (LU-decomposition, Cholesky decomposition) or an exact or least-squares solution (QR-decomposition). Fixes MATH-220. | luc | |

Added removeData methods for the SimpleRegression class. This allows to support regression calculations across a sliding window of (time-based) observations without having to recalculate for the entire window every time. Fixes MATH-219. Thanks to Andrew Berry. | luc | |

Support for one dimensional vectors has been added to the linear algebra package with a RealVector interface, a RealVectorImpl default implementation using a single double array to store elements and a RealVectorFormat for input/output. Thanks to Andreas Rieger. | luc | |

Changed OLS regression implementation added in MATH-203 to use QR decomposition to solve the normal equations. Fixes MATH-217. | psteitz | |

New ODE integrators have been added: the explicit Adams-Bashforth and implicit Adams-Moulton multistep methods. As the implementations of these methods are based on Nordsieck vector rather than a traditional array of previous steps, they both have been improved to handle adaptive stepsize. These methods provide the same rich features has the existing ones: continuous output, step handlers, discrete events, G-stop ... | luc | |

Replaced size adjustment of all steps of fixed steps Runge-Kutta integrators by a truncation of the last step only. Fixes MATH-214. | luc | |

The ODE integrators now support several step handlers at once, instead of just one. This is more consistent with event handlers management. The setStepHandler method has therefore been replaced by addStephandler, the getStepHandler method has been replaced by getStepHandlers which returns a Collection and a clearStepHandlers method has been added. | luc | |

All ODE integrators now support setting a maximal number of evaluations of differential equations function. If this number is exceeded, an exception will be thrown during integration. This can be used to prevent infinite loops if for example error control or discrete events create a really large number of extremely small steps. | luc | |

All step interpolators for ODE integrators now provide interpolation for both the state and its time derivatives. The interpolated derivatives are the exact derivatives of the interpolated state, thus preserving consistency. The general step handlers hence do not need to call the derivation function anymore. The fixed step handlers also get the time derivative of the state as an additional argument along with the state when they are called. | luc | |

Changed return type for FirstOrderIntegrator.integrate() to double in order to retrieve exact stop time. This allows to handle properly integration interruption due to an EventHandler instance asking to stop the integration when its associated event is triggered. The state was already set to the current state at interruption time, but it was difficult to get the corresponding time (it involved setting a step handler monitoring the last step specially). Fixes MATH-213. | luc | |

Events handlers in the ODE package now also provide the switching function variation (increasing/decreasing) when an event occurs | luc | |

Clarified the ODE package by breaking in into several sub-packages and renaming classes (SwitchingFunctions/EventHandler, SwitchingFunctionsHandler/CombinedEventsManager) | luc | |

Changed return type for FirstOrderIntegrator.getSwitchingFunctions() to a collection of SwitchingFunction instances. This better suits the intended use of the method and fixes a visibility error since the previous return type referenced the package private SwitchState class. Fixes MATH-210. | luc | |

Fixed dimension error on output vector for the operate method in RealMatrixImpl and BigMatrixImpl classes. Fixes MATH-209. Thanks to Thomas Chust. | luc | |

The FirstOrderDifferentialEquations, FirstOrderIntegrator and FixedStepHandler interfaces now extends Serializable, allowing integrators, problems and handlers to be embedded into users Serializable classes. | luc | |

Added several convenience methods and constants for Vector3D and Rotation. | luc | |

Replaced public no argument constructors with IDENTITY or ZERO static instances for immutable classes Vector3D and Rotation. | luc | |

Fixed inconsistencies in the naming scheme for static fields in Vector3D and Rotation with respect to the overall library. | luc | |

Greatly improved RealMatrixImpl and BigMatrixImpl performances, both in terms of speed and in terms of temporary memory footprint. | luc | |

Added Mauro's patch to support multiple regression. Fixes MATH-203. Thanks to Mauro Talevi. | luc | |

Starting with version 2.0 of the library, the minimal version of the Java platform required to compile and use Commons Math is Java 5. This version is widely deployed now on many systems. It brings new important features for specific mathematical developments, for example new functions (log10, cbrt, ulp, signum, cosh, sinh, tanh, hypot, expm1, log1p), autoboxing, MathContext or RoundingMode. It also brings important features for general development, for example enums, generics or annotations. | luc | |

Switching functions can now throw dedicated SwitchException from all their method. At upper call level, the various ODE integrators handle these new exceptions and wrap them into IntegratorException instances, hence the integrators methods signature did not change. | luc | |

Added the getSwitchingFunctions and clearSwitchingFunctions to the FirstOrderIntegrator interface and all its implementations Fixes MATH-202. | luc | |

Removed deprecated features. This includes the following changes. Factory-based instantiation replaced by setter injection in 1.2 in several classes have been removed. Protected fields in matrices implementations have been declared final and private. Identity factory methods moved to MatrixUtils class have been removed. Complex utilities methods that have been superseded by Complex instance methods have been removed. | luc | |

Fixed formula in fast cosine transformer javadoc comments. Fixes MATH-205. Thanks to Roman Werpachowski. | luc | |

Javadoc and style fixes. Fixes MATH-193. Thanks to Michael Heuer and Sebb. | brentworden | |

Added an error detection for missing imaginary character while parsing complex string Fixes MATH-198. Thanks to Frederick Salardi. | luc | |

Detect numerical problems in Q.R decomposition for Levenberg-Marquardt estimator and report them appropriately Fixes MATH-199. Thanks to Mick. | luc | |

Fixed several crashes in getCovariances() and guessParametersErrors() in AbstractEstimator when some parameters are bound. The methods now explicitly give result only about unbound parameters. Fixes MATH-200. Thanks to Plamen Petrov. | luc | |

Fixed truncation error in t-test classes for large t values. Fixes MATH-201. Thanks to Peter Wyngaard. | brentworden | |

Added root checks for the endpoints. Fixes MATH-204. Thanks to Mick. | brentworden |

Type | Changes | By |
---|---|---|

Fixed numerous warnings in test code. | luc | |

Use the initial guess provided by the user in BrentSolver.solve(), thus improving speed. Fixes MATH-156. Thanks to Tyler Ward. | luc | |

Added the estimation, optimization, geometry and ode packages from the Mantissa library. | luc | |

Made ComplexFormat format double values with a provided NumberFormat instance instead of using the real part format for all values. Fixes MATH-18. Thanks to Phil Steitz. | brentworden | |

Added Pascal distribution implementation. Fixes MATH-120. Thanks to Todd C. Parnell. | psteitz | |

Added QR Decomposition. Fixes MATH-148. Thanks to Joni Salonen. | psteitz | |

Modified ProperFractionFormat to reject embedded minus signs. Fixes MATH-60. Thanks to Nhung Nnguyen. | psteitz | |

Added a nextAfter method in MathUtils to return the next machine-representable number in a specified direction from a given floating point number. Used this to ensure that MathUtils.round does not return incorrect results for numbers with bad IEEE754 representations. Fixes MATH-151. Thanks to Luc Maisonobe. | psteitz | |

Added Fast Fourier Transform implementation. Fixes MATH-140. Thanks to Xiaogang Zhang. | psteitz | |

Modified getSumSquaredErrors method in SimpleRegression to always return a non-negative result. Fixes MATH-85. Thanks to Mark Osborn, Luc Maisonobe. | psteitz | |

Corrected nextInt and nextLong to handle wide value ranges. Fixes MATH-153. Thanks to Remi Arntzen. | brentworden | |

Increased default precision of Gamma and Beta functions. Fixes MATH-166. Thanks to Lukas Theussl. | psteitz | |

Added log function to MathUtils. Fixes MATH-158. Thanks to Hasan Diwan. | psteitz | |

Added two sample (binned comparison) ChiSquare test. Fixes MATH-160. Thanks to Matthias Hummel. | psteitz | |

Modified NormalDistributionImpl.cumulativeProbablity to catch MaxIterationsExceededException and return 0 or 1, resp. if the argument is more than 20 standard deviations from the mean. Fixes MATH-167. | psteitz | |

Added SynchronizedDescriptiveStatistics class. Fixes MATH-170. Thanks to David J. M. Karlsen. | brentworden | |

Added addAndCheck, mulAndCheck, and subAndCheck MathUtils methods for long integer arguments. Fixes MATH-154. Thanks to Remi Arntzen. | brentworden | |

Merged most functions from ComplexUtils into Complex class, added static factory method to Complex. Fixes MATH-171. Thanks to Niall Pemberton. | psteitz | |

Deprecated abstract factory methods and made DescriptiveStatistics and and SummaryStatistics concrete classes. Pushed implementations up from DescriptiveStatisticsImpl, SummaryStatisticsImpl. Made implementations of statistics configurable via setters. | psteitz | |

Changed Mean.evaluate() to use a two-pass algorithm, improving accuracy by exploiting the the fact that this method has access to the full array of data values. Fixes MATH-174. | psteitz | |

Added check and rescaling of expected counts to sum to sum of expected counts if necessary in ChiSquare test. Fixes MATH-175. Thanks to Carl Anderson. | psteitz | |

Handle multiplication of Complex numbers with infinite parts specially. Fixes MATH-164. | luc | |

Add errors guessing to least-squares estimators. Fixes MATH-176. Thanks to Kazuhiro Koshino. | luc | |

Add tests for Fraction constructor using double parameter. Fixes MATH-179. Thanks to Niall Pemberton. | luc | |

Added one-way ANOVA implementation. Fixes MATH-173. Thanks to Bob MacCallum. | psteitz | |

Add Fraction constructor using max denominator value. Fixes MATH-181. Thanks to Niall Pemberton. | luc | |

Add integer overflow checks in Fraction constructor using double parameter. Fixes MATH-182. | luc | |

Throw EOFException when using empty files with ValueServer in replay and digest modes. Fixes MATH-185. | luc | |

Added a equals and hash methods in MathUtils to check for double arrays | luc | |

Added an angle normalization method in MathUtils to force angles in some user-defined interval | luc | |

Added vectorial covariance computation (either sample or population covariance) | luc | |

Added multivariate summary statistics. | luc | |

Added getSumOfLogs method to SummaryStatistics and made SumOfLogs instance used by GeometricMean configurable. Fixes MATH-191. | psteitz | |

Fixed AbstractIntegerDistribution cumulativeProbablility(-,-) to correctly handle double arguments. Fixes MATH-184. Thanks to Yegor Bryukhov. | psteitz | |

Made numerator and denominator final in Fraction and deprecated protected real and imaginary parts fields in Complex, making Fraction immutable and preparing Complex to become fully immutable in 2.0. Fixes MATH-188. Thanks to Sebastian Bazley. | psteitz |

Type | Changes | By |
---|---|---|

Made NewtonSolver derivative field transient and implemented readObject to initialize. Fixes MATH-74. | psteitz | |

Made sampleStats field private and changed getUpperBounds to return a fresh copy in EmpiricalDistributionImpl. Fixes MATH-74. | psteitz | |

Added polar2Complex method to ComplexUtils to create Complex numbers from polar representations. | psteitz | |

Made all serialVersionUIDs private. Fixes MATH-49. Thanks to Elliotte Harold. | psteitz | |

Improved documentation and test cases related to handling of infinite and NaN values in Complex, ComplexUtils classes. Fixes MATH-5. | psteitz | |

Fixed incorrect NaN handling in o.a.m.s.d.rank.Min, Max Fixes MATH-57. Thanks to Mauro Talevi. | psteitz | |

Changed RealMatrixImpl.equals to use Double.doubleToLongBits to compare corresponding matrix entries. Fixes MATH-74. | psteitz | |

Eliminated floating point equals comparison in Percentile.evaluate. Fixes MATH-74. | psteitz | |

Eliminated unnecessary assignment statements in Skewness.getResult method. Fixes MATH-74. | psteitz | |

Synchronized getters in ResizeableDoubleArray. Fixes MATH-74. | psteitz | |

Eliminated unnecessary assignment statement in BisectionSolver.solve method. Fixes MATH-74. | psteitz | |

Implemented hashCode in the Complex class and changed the semantics of equals to make all instances with real or imaginary part NaN equal. Fixes MATH-74. | psteitz | |

Fixed bin index overflow problem in EmpiricalDistributionImpl. Fixes MATH-12. Thanks to Keith McDonald. | psteitz | |

Added protection against numerical overflow and underflow in the isBracketing method. Fixes MATH-108. Thanks to Xiaogang Zhang. | brentworden | |

Fixed division by zero error in rounding methods. Fixes MATH-47. Thanks to Nikhil Gupte. | brentworden | |

Added upper tail cumulative probability method to HypergeometricDistributionImpl. Fixes MATH-100. Thanks to Mike Hu. | brentworden | |

Added better handling of numerical overflow and division by zero in Complex calculations. Fixes MATH-22. Thanks to Xiaogang Zhang. | brentworden | |

Changed ContinuedFraction to better handle infinite convergents that resulted in divergent continued fraction evaluations. Fixes MATH-92. Thanks to Mikael Weigelt. | brentworden | |

Changed rounding methods to not rely on BigDecimal conversions which was causing numerical error. Fixes MATH-32. Thanks to Srinivas Vemury. | brentworden | |

Changed Fraction(double) to correctly handle near-integral arguments. Fixes MATH-3. Thanks to Jörg Weimar. | psteitz | |

Changed lcm to throw ArithmeticException (instead of returning bogus value) if the result is too large to store as an integer. Fixes MATH-143. Thanks to Jörg Weimar. | psteitz | |

Added factories for TTest, ChiSquareTest and TestUtils class with static methods to create instances and execute tests. Fixes MATH-70. Thanks to Mary Ellen Foster. | psteitz | |

Eliminated repeated endpoint function evalutations in BrentSolver, SecantSolver. Fixes MATH-95. Thanks to Paul Field. | psteitz | |

Added setSubMatrix methods to RealMatrixImpl, BigMatrixImpl. To Preserve backward compatibility with version 1.0, these methods were not added to the RealMatrix, BigMatrix interfaces. Fixes MATH-137. Thanks to Rodrigo di Lorenzo Lopes. | psteitz | |

Added createXIdentityMatrix methods to MatrixUtils and deprecated getIdentity methods in RealMatrixImpl, BigMatrixImpl. Modified RealMatrixImpl, BigMatrixImpl constructors to throw IllegalArgumentExceptions instead of ArrayIndexOutOfBounds when dimension arguments are not positive. | psteitz | |

Made PRNG pluggable for classes in the random package. Added RandomGenerator interface extracted from java.util.random and abstract implementation, AbstractRandomGenerator providing default implementations of methods based on nextDouble(). Added a constructor taking a RandomGenerator as an argument to RandomDataImpl. Changed ValueServer to use a RandomData in its constructor. Changes to 1.0 classes should be backward compatible (including serialization). | psteitz | |

Added utility methods for overflow-checked integer arithmetic and improved gcd method in MathUtils. Thanks to C. Scott Ananian. | psteitz | |

Fixed error in TTestImpl.homoscedasticTtest. Implementation was incorrectly using heteroscedastic t statistic. Also improved sensitivity of test cases. Fixes MATH-79. Thanks to Gilles Gaillard. | psteitz | |

Fixed javadoc errors. One-sided t-test significance adjustment was reversed in javadoc for boolean-valued test methods. Fixes MATH-44. Thanks to Gilles Gaillard. | psteitz | |

Fixed bug in PolynomialSplineFunction to allow evaluation of the function at the last knot point. Thanks to Ben Litchfield. | brentworden | |

Added Weibull distribution implementation. | brentworden | |

Added Cauchy distribution implementation. | brentworden | |

Added convenience methods for rounding. | brentworden | |

Added Fraction class based on commons-lang implementation. With the fraction class, FractionFormat and ProperFractionFormat classes were added to provide fraction formatting and parsing. Thanks to C. Scott Ananian. | brentworden |