org.apache.commons.math.linear

Class BlockRealMatrix

java.lang.Object

org.apache.commons.math.linear.AbstractRealMatrix

org.apache.commons.math.linear.BlockRealMatrix

All Implemented Interfaces:

java.io.Serializable, AnyMatrix, RealMatrix

public class BlockRealMatrix
extends AbstractRealMatrix
implements java.io.Serializable

Cache-friendly implementation of RealMatrix using a flat arrays to store square blocks of the matrix.

This implementation is specially designed to be cache-friendly. Square blocks are stored as small arrays and allow efficient traversal of data both in row major direction and columns major direction, one block at a time. This greatly increases performances for algorithms that use crossed directions loops like multiplication or transposition.

The size of square blocks is a static parameter. It may be tuned according to the cache size of the target computer processor. As a rule of thumbs, it should be the largest value that allows three blocks to be simultaneously cached (this is necessary for example for matrix multiplication). The default value is to use 52x52 blocks which is well suited for processors with 64k L1 cache (one block holds 2704 values or 21632 bytes). This value could be lowered to 36x36 for processors with 32k L1 cache.

The regular blocks represent BLOCK_SIZE x BLOCK_SIZE squares. Blocks at right hand side and bottom side which may be smaller to fit matrix dimensions. The square blocks are flattened in row major order in single dimension arrays which are therefore BLOCK_SIZE² elements long for regular blocks. The blocks are themselves organized in row major order.

As an example, for a block size of 52x52, a 100x60 matrix would be stored in 4 blocks. Block 0 would be a double[2704] array holding the upper left 52x52 square, block 1 would be a double[416] array holding the upper right 52x8 rectangle, block 2 would be a double[2496] array holding the lower left 48x52 rectangle and block 3 would be a double[384] array holding the lower right 48x8 rectangle.

The layout complexity overhead versus simple mapping of matrices to java arrays is negligible for small matrices (about 1%). The gain from cache efficiency leads to up to 3-fold improvements for matrices of moderate to large size.

Since:

2.0

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	BLOCK_SIZE Block size.

Constructor Summary

Constructors

Constructor and Description
BlockRealMatrix(double[][] rawData) Create a new dense matrix copying entries from raw layout data.
BlockRealMatrix(int rows, int columns) Create a new matrix with the supplied row and column dimensions.
BlockRealMatrix(int rows, int columns, double[][] blockData, boolean copyArray) Create a new dense matrix copying entries from block layout data.

Method Summary

Modifier and Type	Method and Description
BlockRealMatrix	add(BlockRealMatrix m) Compute the sum of this and m.
BlockRealMatrix	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.
BlockRealMatrix	copy() Returns a (deep) copy of this.
static double[][]	createBlocksLayout(int rows, int columns) Create a data array in blocks layout.
BlockRealMatrix	createMatrix(int rowDimension, int columnDimension) Create a new RealMatrix of the same type as the instance with the supplied row and column dimensions.
double[]	getColumn(int column) Returns the entries in column number col as an array.
int	getColumnDimension() Returns the number of columns in the matrix.
BlockRealMatrix	getColumnMatrix(int column) Returns the entries in column number column as a column matrix.
RealVector	getColumnVector(int column) Returns the entries in column number column as a vector.
double[][]	getData() Returns matrix entries as a two-dimensional array.
double	getEntry(int row, int column) Returns the entry in the specified row and column.
double	getFrobeniusNorm() Returns the Frobenius norm of the matrix.
double	getNorm() Returns the maximum absolute row sum norm of the matrix.
double[]	getRow(int row) Returns the entries in row number row as an array.
int	getRowDimension() Returns the number of rows in the matrix.
BlockRealMatrix	getRowMatrix(int row) Returns the entries in row number row as a row matrix.
RealVector	getRowVector(int row) Returns the entries in row number row as a vector.
BlockRealMatrix	getSubMatrix(int startRow, int endRow, int startColumn, int endColumn) Gets a submatrix.
BlockRealMatrix	multiply(BlockRealMatrix m) Returns the result of postmultiplying this by m.
BlockRealMatrix	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.
double[]	operate(double[] v) Returns the result of multiplying this by the vector v.
double[]	preMultiply(double[] v) Returns the (row) vector result of premultiplying this by the vector v.
BlockRealMatrix	scalarAdd(double d) Returns the result of adding d to each entry of this.
RealMatrix	scalarMultiply(double d) Returns the result multiplying each entry of this by d.
void	setColumn(int column, double[] array) Sets the entries in column number column as a column matrix.
void	setColumnMatrix(int column, RealMatrix matrix) Sets the entries in column number column as a column matrix.
void	setColumnVector(int column, RealVector vector) Sets the entries in column number column as a vector.
void	setEntry(int row, int column, double value) Set the entry in the specified row and column.
void	setRow(int row, double[] array) Sets the entries in row number row as a row matrix.
void	setRowMatrix(int row, BlockRealMatrix matrix) Sets the entries in row number row as a row matrix.
void	setRowMatrix(int row, RealMatrix matrix) Sets the entries in row number row as a row matrix.
void	setRowVector(int row, RealVector vector) Sets the entries in row number row as a vector.
void	setSubMatrix(double[][] subMatrix, int row, int column) Replace the submatrix starting at row, column using data in the input subMatrix array.
BlockRealMatrix	subtract(BlockRealMatrix m) Compute this minus m.
BlockRealMatrix	subtract(RealMatrix m) Compute this minus m.
static double[][]	toBlocksLayout(double[][] rawData) Convert a data array from raw layout to blocks layout.
BlockRealMatrix	transpose() Returns the transpose of this matrix.
double	walkInOptimizedOrder(RealMatrixChangingVisitor visitor) Visit (and possibly change) all matrix entries using the fastest possible order.
double	walkInOptimizedOrder(RealMatrixChangingVisitor visitor, int startRow, int endRow, int startColumn, int endColumn) Visit (and possibly change) some matrix entries using the fastest possible order.
double	walkInOptimizedOrder(RealMatrixPreservingVisitor visitor) Visit (but don't change) all matrix entries using the fastest possible order.
double	walkInOptimizedOrder(RealMatrixPreservingVisitor visitor, int startRow, int endRow, int startColumn, int endColumn) Visit (but don't change) some matrix entries using the fastest possible order.
double	walkInRowOrder(RealMatrixChangingVisitor visitor) Visit (and possibly change) all matrix entries in row order.
double	walkInRowOrder(RealMatrixChangingVisitor visitor, int startRow, int endRow, int startColumn, int endColumn) Visit (and possibly change) some matrix entries in row order.
double	walkInRowOrder(RealMatrixPreservingVisitor visitor) Visit (but don't change) all matrix entries in row order.
double	walkInRowOrder(RealMatrixPreservingVisitor visitor, int startRow, int endRow, int startColumn, int endColumn) Visit (but don't change) some matrix entries in row order.

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

copySubMatrix, copySubMatrix, equals, getDeterminant, getSubMatrix, getTrace, hashCode, inverse, isSingular, isSquare, luDecompose, operate, preMultiply, preMultiply, solve, solve, toString, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

BLOCK_SIZE

public static final int BLOCK_SIZE

Block size.

See Also:

Constant Field Values

Constructor Detail

BlockRealMatrix

public BlockRealMatrix(int rows,
                       int columns)
                throws java.lang.IllegalArgumentException

Create a new matrix with the supplied row and column dimensions.

Parameters:

rows - the number of rows in the new matrix

columns - the number of columns in the new matrix

Throws:

java.lang.IllegalArgumentException - if row or column dimension is not positive

BlockRealMatrix

public BlockRealMatrix(double[][] rawData)
                throws java.lang.IllegalArgumentException

Create a new dense matrix copying entries from raw layout data.

The input array must already be in raw layout.

Calling this constructor is equivalent to call:

matrix = new BlockRealMatrix(rawData.length, rawData[0].length,
                                   toBlocksLayout(rawData), false);

Parameters:

rawData - data for new matrix, in raw layout

Throws:

java.lang.IllegalArgumentException - if blockData shape is inconsistent with block layout

See Also:

BlockRealMatrix(int, int, double[][], boolean)

BlockRealMatrix

public BlockRealMatrix(int rows,
                       int columns,
                       double[][] blockData,
                       boolean copyArray)
                throws java.lang.IllegalArgumentException

Create a new dense matrix copying entries from block layout data.

The input array must already be in blocks layout.

Parameters:

rows - the number of rows in the new matrix

columns - the number of columns in the new matrix

blockData - data for new matrix

copyArray - if true, the input array will be copied, otherwise it will be referenced

Throws:

java.lang.IllegalArgumentException - if blockData shape is inconsistent with block layout

See Also:

createBlocksLayout(int, int), toBlocksLayout(double[][]), BlockRealMatrix(double[][])

Method Detail

toBlocksLayout

public static double[][] toBlocksLayout(double[][] rawData)
                                 throws java.lang.IllegalArgumentException

Convert a data array from raw layout to blocks layout.

Raw layout is the straightforward layout where element at row i and column j is in array element rawData[i][j]. Blocks layout is the layout used in BlockRealMatrix instances, where the matrix is split in square blocks (except at right and bottom side where blocks may be rectangular to fit matrix size) and each block is stored in a flattened one-dimensional array.

This method creates an array in blocks layout from an input array in raw layout. It can be used to provide the array argument of the BlockRealMatrix(int, int, double[][], boolean) constructor.

Parameters:

rawData - data array in raw layout

Returns:

a new data array containing the same entries but in blocks layout

Throws:

java.lang.IllegalArgumentException - if rawData is not rectangular (not all rows have the same length)

See Also:

createBlocksLayout(int, int), BlockRealMatrix(int, int, double[][], boolean)

createBlocksLayout

public static double[][] createBlocksLayout(int rows,
                                            int columns)

Create a data array in blocks layout.

This method can be used to create the array argument of the BlockRealMatrix(int, int, double[][], boolean) constructor.

Parameters:

rows - the number of rows in the new matrix

columns - the number of columns in the new matrix

Returns:

a new data array in blocks layout

See Also:

toBlocksLayout(double[][]), BlockRealMatrix(int, int, double[][], boolean)

createMatrix

public BlockRealMatrix createMatrix(int rowDimension,
                                    int columnDimension)
                             throws java.lang.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:

java.lang.IllegalArgumentException - if row or column dimension is not positive

copy

public BlockRealMatrix copy()

Returns a (deep) copy of this.

Specified by:

copy in interface RealMatrix

Specified by:

copy in class AbstractRealMatrix

Returns:

matrix copy

add

public BlockRealMatrix add(RealMatrix m)
                    throws java.lang.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:

java.lang.IllegalArgumentException - if m is not the same size as this

add

public BlockRealMatrix add(BlockRealMatrix m)
                    throws java.lang.IllegalArgumentException

Compute the sum of this and m.

Parameters:

m - matrix to be added

Returns:

this + m

Throws:

java.lang.IllegalArgumentException - if m is not the same size as this

subtract

public BlockRealMatrix subtract(RealMatrix m)
                         throws java.lang.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:

java.lang.IllegalArgumentException - if m is not the same size as this

subtract

public BlockRealMatrix subtract(BlockRealMatrix m)
                         throws java.lang.IllegalArgumentException

Compute this minus m.

Parameters:

m - matrix to be subtracted

Returns:

this - m

Throws:

java.lang.IllegalArgumentException - if m is not the same size as this

scalarAdd

public BlockRealMatrix scalarAdd(double d)
                          throws java.lang.IllegalArgumentException

Returns the result of adding d to each entry of this.

Specified by:

scalarAdd in interface RealMatrix

Overrides:

scalarAdd in class AbstractRealMatrix

Parameters:

d - value to be added to each entry

Returns:

d + this

Throws:

java.lang.IllegalArgumentException

scalarMultiply

public RealMatrix scalarMultiply(double d)
                          throws java.lang.IllegalArgumentException

Returns the result multiplying each entry of this by d.

Specified by:

scalarMultiply in interface RealMatrix

Overrides:

scalarMultiply in class AbstractRealMatrix

Parameters:

d - value to multiply all entries by

Returns:

d * this

Throws:

java.lang.IllegalArgumentException

multiply

public BlockRealMatrix multiply(RealMatrix m)
                         throws java.lang.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:

java.lang.IllegalArgumentException - if columnDimension(this) != rowDimension(m)

multiply

public BlockRealMatrix multiply(BlockRealMatrix m)
                         throws java.lang.IllegalArgumentException

Returns the result of postmultiplying this by m.

Parameters:

m - matrix to postmultiply by

Returns:

this * m

Throws:

java.lang.IllegalArgumentException - if columnDimension(this) != rowDimension(m)

getData

public double[][] getData()

Returns matrix entries as a two-dimensional array.

Specified by:

getData in interface RealMatrix

Overrides:

getData in class AbstractRealMatrix

Returns:

2-dimensional array of entries

getNorm

public double getNorm()

Returns the maximum absolute row sum norm of the matrix.

Specified by:

getNorm in interface RealMatrix

Overrides:

getNorm in class AbstractRealMatrix

Returns:

norm

getFrobeniusNorm

public double getFrobeniusNorm()

Returns the Frobenius norm of the matrix.

Specified by:

getFrobeniusNorm in interface RealMatrix

Overrides:

getFrobeniusNorm in class AbstractRealMatrix

Returns:

norm

getSubMatrix

public BlockRealMatrix getSubMatrix(int startRow,
                                    int endRow,
                                    int startColumn,
                                    int endColumn)
                             throws MatrixIndexException

Gets a submatrix. Rows and columns are indicated counting from 0 to n-1.

Specified by:

getSubMatrix in interface RealMatrix

Overrides:

getSubMatrix in class AbstractRealMatrix

Parameters:

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index (inclusive)

Returns:

The subMatrix containing the data of the specified rows and columns

Throws:

MatrixIndexException - if the indices are not valid

setSubMatrix

public void setSubMatrix(double[][] subMatrix,
                         int row,
                         int column)
                  throws MatrixIndexException

Replace the submatrix starting at row, column using data in the input subMatrix array. Indexes are 0-based.

Example:
Starting with

 1  2  3  4
 5  6  7  8
 9  0  1  2
 

and subMatrix = {{3, 4} {5,6}}, invoking setSubMatrix(subMatrix,1,1)) will result in

 1  2  3  4
 5  3  4  8
 9  5  6  2
 

Specified by:

setSubMatrix in interface RealMatrix

Overrides:

setSubMatrix in class AbstractRealMatrix

Parameters:

subMatrix - array containing the submatrix replacement data

row - row coordinate of the top, left element to be replaced

column - column coordinate of the top, left element to be replaced

Throws:

MatrixIndexException - if subMatrix does not fit into this matrix from element in (row, column)

getRowMatrix

public BlockRealMatrix getRowMatrix(int row)
                             throws MatrixIndexException

Returns the entries in row number row as a row matrix. Row indices start at 0.

Specified by:

getRowMatrix in interface RealMatrix

Overrides:

getRowMatrix in class AbstractRealMatrix

Parameters:

row - the row to be fetched

Returns:

row matrix

Throws:

MatrixIndexException - if the specified row index is invalid

setRowMatrix

public void setRowMatrix(int row,
                         RealMatrix matrix)
                  throws MatrixIndexException,
                         InvalidMatrixException

Sets the entries in row number row as a row matrix. Row indices start at 0.

Specified by:

setRowMatrix in interface RealMatrix

Overrides:

setRowMatrix in class AbstractRealMatrix

Parameters:

row - the row to be set

matrix - row matrix (must have one row and the same number of columns as the instance)

Throws:

MatrixIndexException - if the specified row index is invalid

InvalidMatrixException - if the matrix dimensions do not match one instance row

setRowMatrix

public void setRowMatrix(int row,
                         BlockRealMatrix matrix)
                  throws MatrixIndexException,
                         InvalidMatrixException

Sets the entries in row number row as a row matrix. Row indices start at 0.

Parameters:

row - the row to be set

matrix - row matrix (must have one row and the same number of columns as the instance)

Throws:

MatrixIndexException - if the specified row index is invalid

InvalidMatrixException - if the matrix dimensions do not match one instance row

getColumnMatrix

public BlockRealMatrix getColumnMatrix(int column)
                                throws MatrixIndexException

Returns the entries in column number column as a column matrix. Column indices start at 0.

Specified by:

getColumnMatrix in interface RealMatrix

Overrides:

getColumnMatrix in class AbstractRealMatrix

Parameters:

column - the column to be fetched

Returns:

column matrix

Throws:

MatrixIndexException - if the specified column index is invalid

setColumnMatrix

public void setColumnMatrix(int column,
                            RealMatrix matrix)
                     throws MatrixIndexException,
                            InvalidMatrixException

Sets the entries in column number column as a column matrix. Column indices start at 0.

Specified by:

setColumnMatrix in interface RealMatrix

Overrides:

setColumnMatrix in class AbstractRealMatrix

Parameters:

column - the column to be set

matrix - column matrix (must have one column and the same number of rows as the instance)

Throws:

MatrixIndexException - if the specified column index is invalid

InvalidMatrixException - if the matrix dimensions do not match one instance column

getRowVector

public RealVector getRowVector(int row)
                        throws MatrixIndexException

Returns the entries in row number row as a vector. Row indices start at 0.

Specified by:

getRowVector in interface RealMatrix

Overrides:

getRowVector in class AbstractRealMatrix

Parameters:

row - the row to be fetched

Returns:

row vector

Throws:

MatrixIndexException - if the specified row index is invalid

setRowVector

public void setRowVector(int row,
                         RealVector vector)
                  throws MatrixIndexException,
                         InvalidMatrixException

Sets the entries in row number row as a vector. Row indices start at 0.

Specified by:

setRowVector in interface RealMatrix

Overrides:

setRowVector in class AbstractRealMatrix

Parameters:

row - the row to be set

vector - row vector (must have the same number of columns as the instance)

Throws:

MatrixIndexException - if the specified row index is invalid

InvalidMatrixException - if the vector dimension does not match one instance row

getColumnVector

public RealVector getColumnVector(int column)
                           throws MatrixIndexException

Returns the entries in column number column as a vector. Column indices start at 0.

Specified by:

getColumnVector in interface RealMatrix

Overrides:

getColumnVector in class AbstractRealMatrix

Parameters:

column - the column to be fetched

Returns:

column vector

Throws:

MatrixIndexException - if the specified column index is invalid

setColumnVector

public void setColumnVector(int column,
                            RealVector vector)
                     throws MatrixIndexException,
                            InvalidMatrixException

Sets the entries in column number column as a vector. Column indices start at 0.

Specified by:

setColumnVector in interface RealMatrix

Overrides:

setColumnVector in class AbstractRealMatrix

Parameters:

column - the column to be set

vector - column vector (must have the same number of rows as the instance)

Throws:

MatrixIndexException - if the specified column index is invalid

InvalidMatrixException - if the vector dimension does not match one instance column

getRow

public double[] getRow(int row)
                throws MatrixIndexException

Returns the entries in row number row as an array.

Row indices start at 0. A MatrixIndexException is thrown unless 0 <= row < rowDimension.

Specified by:

getRow in interface RealMatrix

Overrides:

getRow in class AbstractRealMatrix

Parameters:

row - the row to be fetched

Returns:

array of entries in the row

Throws:

MatrixIndexException - if the specified row index is not valid

setRow

public void setRow(int row,
                   double[] array)
            throws MatrixIndexException,
                   InvalidMatrixException

Sets the entries in row number row as a row matrix. Row indices start at 0.

Specified by:

setRow in interface RealMatrix

Overrides:

setRow in class AbstractRealMatrix

Parameters:

row - the row to be set

array - row matrix (must have the same number of columns as the instance)

Throws:

MatrixIndexException - if the specified row index is invalid

InvalidMatrixException - if the array size does not match one instance row

getColumn

public double[] getColumn(int column)
                   throws MatrixIndexException

Returns the entries in column number col as an array.

Column indices start at 0. A MatrixIndexException is thrown unless 0 <= column < columnDimension.

Specified by:

getColumn in interface RealMatrix

Overrides:

getColumn in class AbstractRealMatrix

Parameters:

column - the column to be fetched

Returns:

array of entries in the column

Throws:

MatrixIndexException - if the specified column index is not valid

setColumn

public void setColumn(int column,
                      double[] array)
               throws MatrixIndexException,
                      InvalidMatrixException

Sets the entries in column number column as a column matrix. Column indices start at 0.

Specified by:

setColumn in interface RealMatrix

Overrides:

setColumn in class AbstractRealMatrix

Parameters:

column - the column to be set

array - column array (must have the same number of rows as the instance)

Throws:

MatrixIndexException - if the specified column index is invalid

InvalidMatrixException - if the array size does not match one instance column

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 <= row < rowDimension
• 0 <= column < 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

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 <= row < rowDimension
• 0 <= column < 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 <= row < rowDimension
• 0 <= column < 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 <= row < rowDimension
• 0 <= column < 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

transpose

public BlockRealMatrix transpose()

Returns the transpose of this matrix.

Specified by:

transpose in interface RealMatrix

Overrides:

transpose in class AbstractRealMatrix

Returns:

transpose matrix

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

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

operate

public double[] operate(double[] v)
                 throws java.lang.IllegalArgumentException

Returns the result of multiplying this by the vector v.

Specified by:

operate in interface RealMatrix

Overrides:

operate in class AbstractRealMatrix

Parameters:

v - the vector to operate on

Returns:

this*v

Throws:

java.lang.IllegalArgumentException - if columnDimension != v.size()

preMultiply

public double[] preMultiply(double[] v)
                     throws java.lang.IllegalArgumentException

Returns the (row) vector result of premultiplying this by the vector v.

Specified by:

preMultiply in interface RealMatrix

Overrides:

preMultiply in class AbstractRealMatrix

Parameters:

v - the row vector to premultiply by

Returns:

v*this

Throws:

java.lang.IllegalArgumentException - if rowDimension != v.size()

walkInRowOrder

public double walkInRowOrder(RealMatrixChangingVisitor visitor)
                      throws MatrixVisitorException

Visit (and possibly change) all matrix entries in row order.

Row order starts at upper left and iterating through all elements of a row from left to right before going to the leftmost element of the next row.

Specified by:

walkInRowOrder in interface RealMatrix

Overrides:

walkInRowOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

Returns:

the value returned by RealMatrixChangingVisitor.end() at the end of the walk

Throws:

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInRowOrder

public double walkInRowOrder(RealMatrixPreservingVisitor visitor)
                      throws MatrixVisitorException

Visit (but don't change) all matrix entries in row order.

Row order starts at upper left and iterating through all elements of a row from left to right before going to the leftmost element of the next row.

Specified by:

walkInRowOrder in interface RealMatrix

Overrides:

walkInRowOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

Returns:

the value returned by RealMatrixPreservingVisitor.end() at the end of the walk

Throws:

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInRowOrder

public double walkInRowOrder(RealMatrixChangingVisitor visitor,
                             int startRow,
                             int endRow,
                             int startColumn,
                             int endColumn)
                      throws MatrixIndexException,
                             MatrixVisitorException

Visit (and possibly change) some matrix entries in row order.

Row order starts at upper left and iterating through all elements of a row from left to right before going to the leftmost element of the next row.

Specified by:

walkInRowOrder in interface RealMatrix

Overrides:

walkInRowOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index

Returns:

the value returned by RealMatrixChangingVisitor.end() at the end of the walk

Throws:

MatrixIndexException - if the indices are not valid

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInRowOrder

public double walkInRowOrder(RealMatrixPreservingVisitor visitor,
                             int startRow,
                             int endRow,
                             int startColumn,
                             int endColumn)
                      throws MatrixIndexException,
                             MatrixVisitorException

Visit (but don't change) some matrix entries in row order.

Row order starts at upper left and iterating through all elements of a row from left to right before going to the leftmost element of the next row.

Specified by:

walkInRowOrder in interface RealMatrix

Overrides:

walkInRowOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index

Returns:

the value returned by RealMatrixPreservingVisitor.end() at the end of the walk

Throws:

MatrixIndexException - if the indices are not valid

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInOptimizedOrder

public double walkInOptimizedOrder(RealMatrixChangingVisitor visitor)
                            throws MatrixVisitorException

Visit (and possibly change) all matrix entries using the fastest possible order.

The fastest walking order depends on the exact matrix class. It may be different from traditional row or column orders.

Specified by:

walkInOptimizedOrder in interface RealMatrix

Overrides:

walkInOptimizedOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

Returns:

the value returned by RealMatrixChangingVisitor.end() at the end of the walk

Throws:

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInOptimizedOrder

public double walkInOptimizedOrder(RealMatrixPreservingVisitor visitor)
                            throws MatrixVisitorException

Visit (but don't change) all matrix entries using the fastest possible order.

The fastest walking order depends on the exact matrix class. It may be different from traditional row or column orders.

Specified by:

walkInOptimizedOrder in interface RealMatrix

Overrides:

walkInOptimizedOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

Returns:

the value returned by RealMatrixPreservingVisitor.end() at the end of the walk

Throws:

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInOptimizedOrder

public double walkInOptimizedOrder(RealMatrixChangingVisitor visitor,
                                   int startRow,
                                   int endRow,
                                   int startColumn,
                                   int endColumn)
                            throws MatrixIndexException,
                                   MatrixVisitorException

Visit (and possibly change) some matrix entries using the fastest possible order.

The fastest walking order depends on the exact matrix class. It may be different from traditional row or column orders.

Specified by:

walkInOptimizedOrder in interface RealMatrix

Overrides:

walkInOptimizedOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index (inclusive)

Returns:

the value returned by RealMatrixChangingVisitor.end() at the end of the walk

Throws:

MatrixIndexException - if the indices are not valid

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInOptimizedOrder

public double walkInOptimizedOrder(RealMatrixPreservingVisitor visitor,
                                   int startRow,
                                   int endRow,
                                   int startColumn,
                                   int endColumn)
                            throws MatrixIndexException,
                                   MatrixVisitorException

Visit (but don't change) some matrix entries using the fastest possible order.

The fastest walking order depends on the exact matrix class. It may be different from traditional row or column orders.

Specified by:

walkInOptimizedOrder in interface RealMatrix

Overrides:

walkInOptimizedOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index (inclusive)

Returns:

the value returned by RealMatrixPreservingVisitor.end() at the end of the walk

Throws:

MatrixIndexException - if the indices are not valid

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int)