Package org.apache.commons.math.linear

Class OpenMapRealMatrix

java.lang.Object

org.apache.commons.math.linear.AbstractRealMatrix

org.apache.commons.math.linear.OpenMapRealMatrix

All Implemented Interfaces:

Serializable, AnyMatrix, RealMatrix, SparseRealMatrix

public class OpenMapRealMatrix
extends AbstractRealMatrix
implements SparseRealMatrix, Serializable

Sparse matrix implementation based on an open addressed map.

Since:

2.0

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
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

Modifier and Type	Method	Description
OpenMapRealMatrix	add(OpenMapRealMatrix m)	Compute the sum of this and m.
OpenMapRealMatrix	add(RealMatrix m)	Compute the sum of this 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 in the matrix.
double	getEntry(int row, int column)	Returns the entry in the specified row and column.
int	getRowDimension()	Returns the number of rows in the matrix.
OpenMapRealMatrix	multiply(OpenMapRealMatrix m)	Returns the result of postmultiplying this 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)	Compute this minus m.
OpenMapRealMatrix	subtract(RealMatrix m)	Compute this minus m.

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

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

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

isSquare

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

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

Constructor Details

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 Details

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)
                               throws IllegalArgumentException

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

Throws:

IllegalArgumentException - if row or column dimension is not positive

getColumnDimension

public int getColumnDimension()

Returns the number of columns in the matrix.

Specified by:

getColumnDimension in interface AnyMatrix

Specified by:

getColumnDimension in class AbstractRealMatrix

Returns:

columnDimension

add

public OpenMapRealMatrix add(RealMatrix m)
                      throws IllegalArgumentException

Compute the sum of this and m.

Specified by:

add in interface RealMatrix

Overrides:

add in class AbstractRealMatrix

Parameters:

m - matrix to be added

Returns:

this + m

Throws:

IllegalArgumentException - if m is not the same size as this

add

public OpenMapRealMatrix add(OpenMapRealMatrix m)
                      throws IllegalArgumentException

Compute the sum of this and m.

Parameters:

m - matrix to be added

Returns:

this + m

Throws:

IllegalArgumentException - if m is not the same size as this

subtract

public OpenMapRealMatrix subtract(RealMatrix m)
                           throws IllegalArgumentException

Compute this minus m.

Specified by:

subtract in interface RealMatrix

Overrides:

subtract in class AbstractRealMatrix

Parameters:

m - matrix to be subtracted

Returns:

this - m

Throws:

IllegalArgumentException - if m is not the same size as this

subtract

public OpenMapRealMatrix subtract(OpenMapRealMatrix m)
                           throws IllegalArgumentException

Compute this minus m.

Parameters:

m - matrix to be subtracted

Returns:

this - m

Throws:

IllegalArgumentException - if m is not the same size as this

multiply

public RealMatrix multiply(RealMatrix m)
                    throws IllegalArgumentException

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

Throws:

IllegalArgumentException - if columnDimension(this) != rowDimension(m)

multiply

public OpenMapRealMatrix multiply(OpenMapRealMatrix m)
                           throws IllegalArgumentException

Returns the result of postmultiplying this by m.

Parameters:

m - matrix to postmultiply by

Returns:

this * m

Throws:

IllegalArgumentException - if columnDimension(this) != rowDimension(m)

getEntry

public double getEntry(int row,
 int column)
                throws MatrixIndexException

Returns the entry in the specified row and column.

Row and column indices start at 0 and must satisfy

• 0 invalid input: '<'= row invalid input: '<' rowDimension
• 0 invalid input: '<'= column invalid input: '<' columnDimension

otherwise a MatrixIndexException is thrown.

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:

matrix entry in row,column

Throws:

MatrixIndexException - if the row or column index is not valid

getRowDimension

public int getRowDimension()

Returns the number of rows in the matrix.

Specified by:

getRowDimension in interface AnyMatrix

Specified by:

getRowDimension in class AbstractRealMatrix

Returns:

rowDimension

setEntry

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

Set the entry in the specified row and column.

Row and column indices start at 0 and must satisfy

• 0 invalid input: '<'= row invalid input: '<' rowDimension
• 0 invalid input: '<'= column invalid input: '<' columnDimension

otherwise a MatrixIndexException is thrown.

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 in row,column

Throws:

MatrixIndexException - if the row or column index is not valid

addToEntry

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

Change an entry in the specified row and column.

Row and column indices start at 0 and must satisfy

• 0 invalid input: '<'= row invalid input: '<' rowDimension
• 0 invalid input: '<'= column invalid input: '<' columnDimension

otherwise a MatrixIndexException is thrown.

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 current matrix entry in row,column

Throws:

MatrixIndexException - if the row or column index is not valid

multiplyEntry

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

Change an entry in the specified row and column.

Row and column indices start at 0 and must satisfy

• 0 invalid input: '<'= row invalid input: '<' rowDimension
• 0 invalid input: '<'= column invalid input: '<' columnDimension

otherwise a MatrixIndexException is thrown.

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 current matrix entry in row,column

Throws:

MatrixIndexException - if the row or column index is not valid