Package org.cicirello.math.la

Class MatrixOps

java.lang.Object

org.cicirello.math.la.MatrixOps

public final class MatrixOps
extends Object

Utility class of basic linear algebra matrix operations, where matrices are represented as 2-D Java arrays.

Method Summary

Modifier and Type	Method	Description
static double[][]	difference(double[][] A, double[][] B)	Computes C = A - B.
static double[][]	difference(double[][] A, double[][] B, double[][] C)	Computes C = A - B.
static int[][]	difference(int[][] A, int[][] B)	Computes C = A - B.
static int[][]	difference(int[][] A, int[][] B, int[][] C)	Computes C = A - B.
static double[][]	product(double[][] A, double[][] B)	Computes C = A * B.
static double[][]	product(double[][] A, double[][] B, double[][] C)	Computes C = A * B.
static int[][]	product(int[][] A, int[][] B)	Computes C = A * B.
static int[][]	product(int[][] A, int[][] B, int[][] C)	Computes C = A * B.
static double[][]	sum(double[][] A, double[][] B)	Computes C = A + B.
static double[][]	sum(double[][] A, double[][] B, double[][] C)	Computes C = A + B.
static int[][]	sum(int[][] A, int[][] B)	Computes C = A + B.
static int[][]	sum(int[][] A, int[][] B, int[][] C)	Computes C = A + B.
static double[][]	transposeSquareMatrixInline(double[][] matrix)	Transpose a square matrix inline.
static int[][]	transposeSquareMatrixInline(int[][] matrix)	Transpose a square matrix inline.

Methods inherited from class java.lang.Object

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

Method Detail

transposeSquareMatrixInline

public static int[][] transposeSquareMatrixInline(int[][] matrix)

Transpose a square matrix inline.

Parameters:

matrix - the matrix to transpose, with result replacing contents of matrix.

Returns:

The matrix is returned for convenience for passing to other methods requiring a matrix as parameter. It is the same object reference that was passed as a parameter.

transposeSquareMatrixInline

public static double[][] transposeSquareMatrixInline(double[][] matrix)

Transpose a square matrix inline.

Parameters:

matrix - the matrix to transpose, with result replacing contents of matrix.

Returns:

The matrix is returned for convenience for passing to other methods requiring a matrix as parameter. It is the same object reference that was passed as a parameter.

sum

public static int[][] sum(int[][] A,
                          int[][] B,
                          int[][] C)

Computes C = A + B.

Parameters:

A - matrix

B - matrix

C - if C is null then a new matrix is constructed for result, otherwise C is used for result.

Returns:

A reference to the C matrix.

sum

public static double[][] sum(double[][] A,
                             double[][] B,
                             double[][] C)

Computes C = A + B.

Parameters:

A - matrix

B - matrix

C - if C is null then a new matrix is constructed for result, otherwise C is used for result.

Returns:

A reference to the C matrix.

sum

public static int[][] sum(int[][] A,
                          int[][] B)

Computes C = A + B.

Parameters:

A - matrix

B - matrix

Returns:

A reference to a new matrix C containing the sum.

sum

public static double[][] sum(double[][] A,
                             double[][] B)

Computes C = A + B.

Parameters:

A - matrix

B - matrix

Returns:

A reference to a new matrix C containing the sum.

difference

public static int[][] difference(int[][] A,
                                 int[][] B,
                                 int[][] C)

Computes C = A - B.

Parameters:

A - matrix

B - matrix

C - if C is null then a new matrix is constructed for result, otherwise C is used for result.

Returns:

A reference to the C matrix.

difference

public static double[][] difference(double[][] A,
                                    double[][] B,
                                    double[][] C)

Computes C = A - B.

Parameters:

A - matrix

B - matrix

C - if C is null then a new matrix is constructed for result, otherwise C is used for result.

Returns:

A reference to the C matrix.

difference

public static int[][] difference(int[][] A,
                                 int[][] B)

Computes C = A - B.

Parameters:

A - matrix

B - matrix

Returns:

A reference to a new matrix C containing the difference.

difference

public static double[][] difference(double[][] A,
                                    double[][] B)

Computes C = A - B.

Parameters:

A - matrix

B - matrix

Returns:

A reference to a new matrix C containing the difference.

product

public static int[][] product(int[][] A,
                              int[][] B,
                              int[][] C)

Computes C = A * B.

Parameters:

A - matrix

B - matrix

C - if C is null then a new matrix is constructed for result, otherwise C is used for result.

Returns:

A reference to the C matrix.

product

public static double[][] product(double[][] A,
                                 double[][] B,
                                 double[][] C)

Computes C = A * B.

Parameters:

A - matrix

B - matrix

C - if C is null then a new matrix is constructed for result, otherwise C is used for result.

Returns:

A reference to the C matrix.

product

public static int[][] product(int[][] A,
                              int[][] B)

Computes C = A * B.

Parameters:

A - matrix

B - matrix

Returns:

A reference to a new matrix C containing the product.

product

public static double[][] product(double[][] A,
                                 double[][] B)

Computes C = A * B.

Parameters:

A - matrix

B - matrix

Returns:

A reference to a new matrix C containing the product.