Jampack

Class Zludpp

java.lang.Object

Jampack.Zludpp

public class Zludpp
extends java.lang.Object

Zludpp implements the LU decomposition with partial pivoting. Specifically, given a matrix A, there is a permunation matrix P, a unit lower triangular matrix L whose subdiagonal elements are less than one in magnitude and a upper triangular matrix U such that

     A = PLU

Zludpp represents P as a pivot array (see Pivot.java ), L as a Zltmat, and U as a Zutmat.

Field Summary

Fields

Modifier and Type	Field and Description
Zltmat	L The lower triangular matrix L
int	ncl The number of columns in L
int	nrl The number of rows in L
int[]	pvt The pivot array (see Pivot.java )
Zutmat	U The upper triangular matrix U

Constructor Summary

Constructors

Constructor and Description
Zludpp(Zmat A) Computes the partially pivoted LU decompostion.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

nrl

public int nrl

The number of rows in L

ncl

public int ncl

The number of columns in L

pvt

public int[] pvt

The pivot array (see Pivot.java )

L

public Zltmat L

The lower triangular matrix L

U

public Zutmat U

The upper triangular matrix U

Constructor Detail

Zludpp

public Zludpp(Zmat A)
       throws JampackException

Computes the partially pivoted LU decompostion.

Parameters:

A - A Zmat

Throws:

JampackException - Passed from below.