jmathlib.toolbox.jmathlib.matrix._private.Jampack
Class Zqrd

java.lang.Object
  jmathlib.toolbox.jmathlib.matrix._private.Jampack.Zqrd

public class Zqrd
extends java.lang.Object

Implements a QR decomposition. Specifically, given a matrix A there are is a unitary matrix Q such that

    QHA = R

where R is zero below its diagonal. In constructing this decomposition, Zqrd represents Q as a Zmat. R is represented by a Zutmat.

At a later stage an economical version of the decomposition will be implemented, in which only A.nc columns of Q are returned.

Version:

Pre-alpha

Author:

G. W. Stewart

Field Summary

Zmat	Q The unitary matrix Q
Zutmat	R The R factor.

Constructor Summary

Zqrd(Zmat A)
Constructs a Zqrd from a Zmat.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

Q

public Zmat Q

The unitary matrix Q

R

public Zutmat R

The R factor. If A.nr>A.nc then R is square of order A.nc. Otherwise R has the same dimensions as A.

Constructor Detail

Zqrd

public Zqrd(Zmat A)
     throws JampackException

Constructs a Zqrd from a Zmat.

Parameters:

A - A Zmat

Throws:

JampackException - Passed from below.