org.ejml.data

Class Matrix64F

java.lang.Object

org.ejml.data.Matrix64F

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

D1Matrix64F

public abstract class Matrix64F
extends Object
implements Serializable

An abstract class for all 64 bit floating point rectangular matrices.

Author:

Peter Abeles

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
int	numCols Number of columns in the matrix.
int	numRows Number of rows in the matrix.

Constructor Summary

Constructors

Constructor and Description
Matrix64F()

Method Summary

Methods

Modifier and Type	Method and Description
abstract <T extends Matrix64F> T	copy()
abstract double	get(int row, int col) Returns the value of value of the specified matrix element.
int	getNumCols() Returns the number of columns in this matrix.
abstract int	getNumElements() Returns the number of elements in this matrix, which is the number of rows times the number of columns.
int	getNumRows() Returns the number of rows in this matrix.
MatrixIterator	iterator(boolean rowMajor, int minRow, int minCol, int maxRow, int maxCol) Creates a new iterator for traversing through a submatrix inside this matrix.
abstract void	print()
void	reshape(int numRows, int numCols) Equivalent to invoking reshape(numRows,numCols,false);
abstract void	reshape(int numRows, int numCols, boolean saveValues) Changes the number of rows and columns in the matrix, allowing its size to grow or shrink.
abstract void	set(int row, int col, double val) Sets the value of the specified matrix element.
void	set(Matrix64F A) Assigns the value of 'this' matrix to be the same as 'A'.
abstract double	unsafe_get(int row, int col) Same as get(int, int) but does not perform bounds check on input parameters.
abstract void	unsafe_set(int row, int col, double val) Same as set(int, int, double) but does not perform bounds check on input parameters.

Methods inherited from class java.lang.Object

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

Field Detail

numRows

public int numRows

Number of rows in the matrix.

numCols

public int numCols

Number of columns in the matrix.

Constructor Detail

Matrix64F

public Matrix64F()

Method Detail

reshape

public abstract void reshape(int numRows,
           int numCols,
           boolean saveValues)

Changes the number of rows and columns in the matrix, allowing its size to grow or shrink. If the saveValues flag is set to true, then the previous values will be maintained, but reassigned to new elements in a row-major ordering. If saveValues is false values will only be maintained when the requested size is less than or equal to the internal array size. The primary use for this function is to encourage data reuse and avoid unnecessarily declaring and initialization of new memory.

Examples:
[ 1 2 ; 3 4 ] -> reshape( 2 , 3 , true ) = [ 1 2 3 ; 4 0 0 ]
[ 1 2 ; 3 4 ] -> reshape( 1 , 2 , true ) = [ 1 2 ]
[ 1 2 ; 3 4 ] -> reshape( 1 , 2 , false ) = [ 1 2 ]
[ 1 2 ; 3 4 ] -> reshape( 2 , 3 , false ) = [ 0 0 0 ; 0 0 0 ]

Parameters:

numRows - The new number of rows in the matrix.

numCols - The new number of columns in the matrix.

saveValues - If true then the value of each element will be save using a row-major reordering. Typically this should be false.

reshape

public void reshape(int numRows,
           int numCols)

Equivalent to invoking reshape(numRows,numCols,false);

Parameters:

numRows - The new number of rows in the matrix.

numCols - The new number of columns in the matrix.

get

public abstract double get(int row,
         int col)

Returns the value of value of the specified matrix element.

Parameters:

row - Matrix element's row index..

col - Matrix element's column index.

Returns:

The specified element's value.

unsafe_get

public abstract double unsafe_get(int row,
                int col)

Same as get(int, int) but does not perform bounds check on input parameters. This results in about a 25% speed increase but potentially sacrifices stability and makes it more difficult to track down simple errors. It is not recommended that this function be used, except in highly optimized code where the bounds are implicitly being checked.

Parameters:

row - Matrix element's row index..

col - Matrix element's column index.

Returns:

The specified element's value.

set

public abstract void set(int row,
       int col,
       double val)

Sets the value of the specified matrix element.

Parameters:

row - Matrix element's row index..

col - Matrix element's column index.

val - The element's new value.

unsafe_set

public abstract void unsafe_set(int row,
              int col,
              double val)

Same as set(int, int, double) but does not perform bounds check on input parameters. This results in about a 25% speed increase but potentially sacrifices stability and makes it more difficult to track down simple errors. It is not recommended that this function be used, except in highly optimized code where the bounds are implicitly being checked.

Parameters:

row - Matrix element's row index..

col - Matrix element's column index.

val - The element's new value.

iterator

public MatrixIterator iterator(boolean rowMajor,
                      int minRow,
                      int minCol,
                      int maxRow,
                      int maxCol)

Creates a new iterator for traversing through a submatrix inside this matrix. It can be traversed by row or by column. Range of elements is inclusive, e.g. minRow = 0 and maxRow = 1 will include rows 0 and 1. The iteration starts at (minRow,minCol) and ends at (maxRow,maxCol)

Parameters:

rowMajor - true means it will traverse through the submatrix by row first, false by columns.

minRow - first row it will start at.

minCol - first column it will start at.

maxRow - last row it will stop at.

maxCol - last column it will stop at.

Returns:

A new MatrixIterator

getNumRows

public int getNumRows()

Returns the number of rows in this matrix.

Returns:

Number of rows.

getNumCols

public int getNumCols()

Returns the number of columns in this matrix.

Returns:

Number of columns.

getNumElements

public abstract int getNumElements()

Returns the number of elements in this matrix, which is the number of rows times the number of columns.

Returns:

Number of elements in this matrix.

set

public void set(Matrix64F A)

Assigns the value of 'this' matrix to be the same as 'A'. The shape of both matrices must be the same.

Parameters:

A - The matrix whose value is to be copied into 'this'.

copy

public abstract <T extends Matrix64F> T copy()

print

public abstract void print()