org.apache.commons.math.linear
Class OpenMapRealMatrix

java.lang.Object
  org.apache.commons.math.linear.RealLinearOperator
      org.apache.commons.math.linear.AbstractRealMatrix
          org.apache.commons.math.linear.OpenMapRealMatrix

All Implemented Interfaces:

java.io.Serializable, AnyMatrix, RealMatrix, SparseRealMatrix

public class OpenMapRealMatrix
extends AbstractRealMatrix
implements SparseRealMatrix, java.io.Serializable

Sparse matrix implementation based on an open addressed map.

Since:

2.0

Version:

$Id: OpenMapRealMatrix.java 1181181 2011-10-10 19:56:03Z luc $

See Also:

Serialized Form

Constructor Summary

OpenMapRealMatrix(int rowDimension, int columnDimension)
Build a sparse matrix with the supplied row and column dimensions.

OpenMapRealMatrix(OpenMapRealMatrix matrix)
Build a matrix by copying another one.

Method Summary

OpenMapRealMatrix	add(OpenMapRealMatrix m) Compute the sum of this matrix and m.
void	addToEntry(int row, int column, double increment) Change an entry in the specified row and column.
OpenMapRealMatrix	copy() Returns a (deep) copy of this.
OpenMapRealMatrix	createMatrix(int rowDimension, int columnDimension) Create a new RealMatrix of the same type as the instance with the supplied row and column dimensions.
int	getColumnDimension() Returns the number of columns of this matrix.
double	getEntry(int row, int column) Get the entry in the specified row and column.
int	getRowDimension() Returns the number of rows of this matrix.
OpenMapRealMatrix	multiply(OpenMapRealMatrix m) Postmultiply this matrix by m.
RealMatrix	multiply(RealMatrix m) Returns the result of postmultiplying this by m.
void	multiplyEntry(int row, int column, double factor) Change an entry in the specified row and column.
void	setEntry(int row, int column, double value) Set the entry in the specified row and column.
OpenMapRealMatrix	subtract(OpenMapRealMatrix m) Subtract m from this matrix.
OpenMapRealMatrix	subtract(RealMatrix m) Compute this minus m.

Methods inherited from class org.apache.commons.math.linear.AbstractRealMatrix

add, copySubMatrix, copySubMatrix, equals, getColumn, getColumnMatrix, getColumnVector, getData, getFrobeniusNorm, getNorm, getRow, getRowMatrix, getRowVector, getSubMatrix, getSubMatrix, getTrace, hashCode, isSquare, operate, operate, power, preMultiply, preMultiply, preMultiply, scalarAdd, scalarMultiply, setColumn, setColumnMatrix, setColumnVector, setRow, setRowMatrix, setRowVector, setSubMatrix, toString, transpose, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.commons.math.linear.RealMatrix

add, copySubMatrix, copySubMatrix, getColumn, getColumnMatrix, getColumnVector, getData, getFrobeniusNorm, getNorm, getRow, getRowMatrix, getRowVector, getSubMatrix, getSubMatrix, getTrace, operate, operate, power, preMultiply, preMultiply, preMultiply, scalarAdd, scalarMultiply, setColumn, setColumnMatrix, setColumnVector, setRow, setRowMatrix, setRowVector, setSubMatrix, transpose, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder

Methods inherited from interface org.apache.commons.math.linear.AnyMatrix

isSquare

Constructor Detail

OpenMapRealMatrix

public OpenMapRealMatrix(int rowDimension,
                         int columnDimension)

Build a sparse matrix with the supplied row and column dimensions.

Parameters:

rowDimension - Number of rows of the matrix.

columnDimension - Number of columns of the matrix.

OpenMapRealMatrix

public OpenMapRealMatrix(OpenMapRealMatrix matrix)

Build a matrix by copying another one.

Parameters:

matrix - matrix to copy.

Method Detail

copy

public OpenMapRealMatrix copy()

Returns a (deep) copy of this.

Specified by:

copy in interface RealMatrix

Specified by:

copy in class AbstractRealMatrix

Returns:

matrix copy

createMatrix

public OpenMapRealMatrix createMatrix(int rowDimension,
                                      int columnDimension)

Create a new RealMatrix of the same type as the instance with the supplied row and column dimensions.

Specified by:

createMatrix in interface RealMatrix

Specified by:

createMatrix in class AbstractRealMatrix

Parameters:

rowDimension - the number of rows in the new matrix

columnDimension - the number of columns in the new matrix

Returns:

a new matrix of the same type as the instance

getColumnDimension

public int getColumnDimension()

Returns the number of columns of this matrix.

Specified by:

getColumnDimension in interface AnyMatrix

Specified by:

getColumnDimension in class AbstractRealMatrix

Returns:

the number of columns.

add

public OpenMapRealMatrix add(OpenMapRealMatrix m)

Compute the sum of this matrix and m.

Parameters:

m - Matrix to be added.

Returns:

this + m.

Throws:

DimensionMismatchException - if m is not the same size as this matrix.

subtract

public OpenMapRealMatrix subtract(RealMatrix m)

Compute this minus m.

Specified by:

subtract in interface RealMatrix

Overrides:

subtract in class AbstractRealMatrix

Parameters:

m - matrix to be subtracted

Returns:

this - m

subtract

public OpenMapRealMatrix subtract(OpenMapRealMatrix m)

Subtract m from this matrix.

Parameters:

m - Matrix to be subtracted.

Returns:

this - m.

Throws:

DimensionMismatchException - if m is not the same size as this matrix.

multiply

public RealMatrix multiply(RealMatrix m)

Returns the result of postmultiplying this by m.

Specified by:

multiply in interface RealMatrix

Overrides:

multiply in class AbstractRealMatrix

Parameters:

m - matrix to postmultiply by

Returns:

this * m

multiply

public OpenMapRealMatrix multiply(OpenMapRealMatrix m)

Postmultiply this matrix by m.

Parameters:

m - Matrix to postmultiply by.

Returns:

this * m.

Throws:

MatrixDimensionMismatchException - if the number of rows of m differ from the number of columns of this matrix.

getEntry

public double getEntry(int row,
                       int column)

Get the entry in the specified row and column. Row and column indices start at 0.

Specified by:

getEntry in interface RealMatrix

Specified by:

getEntry in class AbstractRealMatrix

Parameters:

row - Row location of entry to be fetched.

column - Column location of entry to be fetched.

Returns:

the matrix entry at (row, column).

getRowDimension

public int getRowDimension()

Returns the number of rows of this matrix.

Specified by:

getRowDimension in interface AnyMatrix

Specified by:

getRowDimension in class AbstractRealMatrix

Returns:

the number of rows.

setEntry

public void setEntry(int row,
                     int column,
                     double value)

Set the entry in the specified row and column. Row and column indices start at 0.

Specified by:

setEntry in interface RealMatrix

Specified by:

setEntry in class AbstractRealMatrix

Parameters:

row - Row location of entry to be set.

column - Column location of entry to be set.

value - matrix entry to be set.

addToEntry

public void addToEntry(int row,
                       int column,
                       double increment)

Change an entry in the specified row and column. Row and column indices start at 0.

Specified by:

addToEntry in interface RealMatrix

Specified by:

addToEntry in class AbstractRealMatrix

Parameters:

row - Row location of entry to be set.

column - Column location of entry to be set.

increment - value to add to the matrix entry.

multiplyEntry

public void multiplyEntry(int row,
                          int column,
                          double factor)

Change an entry in the specified row and column. Row and column indices start at 0.

Specified by:

multiplyEntry in interface RealMatrix

Specified by:

multiplyEntry in class AbstractRealMatrix

Parameters:

row - Row location of entry to be set.

column - Column location of entry to be set.

factor - Multiplication factor for the matrix entry.