no.uib.cipr.matrix
Class QR

java.lang.Object
  no.uib.cipr.matrix.QR

public class QR
extends java.lang.Object

Computers QR decompositions

Constructor Summary

QR(int m, int n)
Constructs an empty QR decomposition

Method Summary

QR	factor(DenseMatrix A) Computes an orthogonal decomposition
static QR	factorize(Matrix A) Convenience method to compute a QR decomposition
DenseMatrix	getQ() Returns the orthogonal part of the factorization
UpperTriangDenseMatrix	getR() Returns the upper triangular factor

Methods inherited from class java.lang.Object

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

Constructor Detail

QR

public QR(int m,
          int n)

Constructs an empty QR decomposition

Parameters:

m - Number of rows. Must be larger than or equal the number of columns

n - Number of columns

Method Detail

factorize

public static QR factorize(Matrix A)

Convenience method to compute a QR decomposition

Parameters:

A - Matrix to decompose. Not modified

Returns:

Newly allocated decomposition

factor

public QR factor(DenseMatrix A)

Computes an orthogonal decomposition

Parameters:

A - Matrix to decompose. Overwritten on exit. Pass a copy to avoid this

Returns:

The current decomposition

getR

public UpperTriangDenseMatrix getR()

Returns the upper triangular factor

getQ

public DenseMatrix getQ()

Returns the orthogonal part of the factorization