VirtualOrganization.Math
Class LUDecomposition

java.lang.Object
  |
  +--VirtualOrganization.Math.LUDecomposition

public class LUDecomposition

extends java.lang.Object

Constructor Summary

LUDecomposition(VirtualOrganization.Math.Matrix A)

Method Summary

double	determinant() Determinant
double[]	getDoublePivot() Return pivot permutation vector as a one-dimensional double array
VirtualOrganization.Math.Matrix	getL() Return lower triangular factor
int[]	getPivot() Return pivot permutation vector
VirtualOrganization.Math.Matrix	getU() Return upper triangular factor
boolean	isNonsingular()
VirtualOrganization.Math.Matrix	solve(VirtualOrganization.Math.Matrix B) Solve A*X = B

Methods inherited from class java.lang.Object

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

Constructor Detail

LUDecomposition

public LUDecomposition(VirtualOrganization.Math.Matrix A)

Method Detail

isNonsingular

public boolean isNonsingular()

getL

public VirtualOrganization.Math.Matrix getL()

Return lower triangular factor

Returns:

L

getU

public VirtualOrganization.Math.Matrix getU()

Return upper triangular factor

Returns:

U

getPivot

public int[] getPivot()

Return pivot permutation vector

Returns:

piv

getDoublePivot

public double[] getDoublePivot()

Return pivot permutation vector as a one-dimensional double array

Returns:

(double) piv

determinant

public double determinant()

Determinant

Returns:

det(A)

Throws:

java.lang.IllegalArgumentException - Matrix must be square

solve

public VirtualOrganization.Math.Matrix solve(VirtualOrganization.Math.Matrix B)

Solve A*X = B

Parameters:

B - A Matrix with as many rows as A and any number of columns.

Returns:

X so that L*U*X = B(piv,:)

Throws:

java.lang.IllegalArgumentException - Matrix row dimensions must agree.

java.lang.RuntimeException - Matrix is singular.