hex.psvm.psvm

Class MatrixUtils

java.lang.Object

hex.psvm.psvm.MatrixUtils

public class MatrixUtils
extends java.lang.Object

Utils class for matrix operations. See also {code DMatrix.java}

Constructor Summary

Constructors

Constructor and Description
MatrixUtils()

Method Summary

Modifier and Type	Method and Description
static hex.psvm.psvm.LLMatrix	productMtDM(water.fvec.Frame m, water.fvec.Vec diagonal) Calculates matrix product M'DM
static double[]	productMtv(water.fvec.Frame m, water.fvec.Vec v) Calculates matrix-vector product M'v

Methods inherited from class java.lang.Object

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

Constructor Detail

MatrixUtils

public MatrixUtils()

Method Detail

productMtDM

public static hex.psvm.psvm.LLMatrix productMtDM(water.fvec.Frame m,
                                                 water.fvec.Vec diagonal)

Calculates matrix product M'DM

Parameters:

m - Frame representing the M matrix (m x n), M' is expected to be lower triangular

diagonal - Vec representation of a diagonal matrix (m x m)

Returns:

lower triangular portion of the product (the product is a symmetrical matrix, only the lower portion is represented)

productMtv

public static double[] productMtv(water.fvec.Frame m,
                                  water.fvec.Vec v)

Calculates matrix-vector product M'v

Parameters:

m - Frame representing matrix M (m x n)

v - Vec representing vector v (m x 1)

Returns:

m-element array representing the result of the product