Package org.apache.commons.math4.legacy.fitting

Class SimpleCurveFitter.ParameterGuesser

java.lang.Object

org.apache.commons.math4.legacy.fitting.SimpleCurveFitter.ParameterGuesser

Direct Known Subclasses:

GaussianCurveFitter.ParameterGuesser, HarmonicCurveFitter.ParameterGuesser

Enclosing class:

SimpleCurveFitter

public abstract static class SimpleCurveFitter.ParameterGuesser
extends Object

Guesses the parameters.

Constructor Summary

Constructors

Constructor	Description
ParameterGuesser()

Method Summary

Modifier and Type	Method	Description
protected int	findMaxY(WeightedObservedPoint[] points)	Finds index of point in specified points with the largest Y.
abstract double[]	guess(Collection<WeightedObservedPoint> obs)	Computes an estimation of the parameters.
protected double	interpolateXAtY(WeightedObservedPoint[] points, int startIdx, int idxStep, double y)	Interpolates using the specified points to determine X at the specified Y.
protected List<WeightedObservedPoint>	sortObservations(Collection<WeightedObservedPoint> unsorted)	Sort the observations.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ParameterGuesser

public ParameterGuesser()

Method Detail

guess

public abstract double[] guess(Collection<WeightedObservedPoint> obs)

Computes an estimation of the parameters.

Parameters:

obs - Observations.

Returns:

the guessed parameters.

sortObservations

protected List<WeightedObservedPoint> sortObservations(Collection<WeightedObservedPoint> unsorted)

Sort the observations.

Parameters:

unsorted - Input observations.

Returns:

the input observations, sorted.

findMaxY

protected int findMaxY(WeightedObservedPoint[] points)

Finds index of point in specified points with the largest Y.

Parameters:

points - Points to search.

Returns:

the index in specified points array.

interpolateXAtY

protected double interpolateXAtY(WeightedObservedPoint[] points,
                                 int startIdx,
                                 int idxStep,
                                 double y)

Interpolates using the specified points to determine X at the specified Y.

Parameters:

points - Points to use for interpolation.

startIdx - Index within points from which to start the search for interpolation bounds points.

idxStep - Index step for searching interpolation bounds points.

y - Y value for which X should be determined.

Returns:

the value of X for the specified Y.

Throws:

ZeroException - if idxStep is 0.

OutOfRangeException - if specified y is not within the range of the specified points.