jdistlib.matrix

Class QMatrixUtils

java.lang.Object

jdistlib.matrix.QMatrixUtils

public class QMatrixUtils
extends java.lang.Object

Matrix utilities

Author:

Roby Joehanes

Constructor Summary

Constructors

Constructor and Description
QMatrixUtils()

Method Summary

Modifier and Type	Method and Description
static double[][]	calculateXtY(double[][] X, double[][] Y) Calculate X'Y.
static double[][]	calculateXY(double[][] X, double[][] Y) Calculate XY.
static double[][]	calculateXYt(double[][] X, double[][] Y) Calculate XY'.

Methods inherited from class java.lang.Object

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

Constructor Detail

QMatrixUtils

public QMatrixUtils()

Method Detail

calculateXY

public static final double[][] calculateXY(double[][] X,
                                           double[][] Y)

Calculate XY. Eliminate the need to instantiate a matrix.

Parameters:

X - (n x m)

Y - (m x p)

Returns:

X * Y

calculateXYt

public static final double[][] calculateXYt(double[][] X,
                                            double[][] Y)

Calculate XY'. Eliminate the need to transpose.

Parameters:

X -

Y -

Returns:

X * Y'

calculateXtY

public static final double[][] calculateXtY(double[][] X,
                                            double[][] Y)

Calculate X'Y. Eliminate the need to transpose.

Parameters:

X -

Y -

Returns:

X'Y