no.uib.cipr.matrix

Class SymmPackEVD

java.lang.Object

no.uib.cipr.matrix.SymmPackEVD

public class SymmPackEVD
extends Object

Computes eigenvalues of symmetrical, packed matrices

Constructor Summary

Constructors

Constructor and Description
SymmPackEVD(int n, boolean upper) Sets up an eigenvalue decomposition for symmetrical, packed matrices.
SymmPackEVD(int n, boolean upper, boolean vectors) Sets up an eigenvalue decomposition for symmetrical, packed matrices

Method Summary

Modifier and Type	Method and Description
SymmPackEVD	factor(LowerSymmPackMatrix A) Computes the eigenvalue decomposition of the given matrix
SymmPackEVD	factor(UpperSymmPackMatrix A) Computes the eigenvalue decomposition of the given matrix
static SymmPackEVD	factorize(Matrix A) Convenience method for computing the full eigenvalue decomposition of the given matrix
double[]	getEigenvalues() Gets the eigenvalues (stored in ascending order)
DenseMatrix	getEigenvectors() Gets the eigenvectors, if available
boolean	hasEigenvectors() True if the eigenvectors have been computed

Methods inherited from class java.lang.Object

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

Constructor Detail

SymmPackEVD

public SymmPackEVD(int n,
                   boolean upper)

Sets up an eigenvalue decomposition for symmetrical, packed matrices. Computes all eigenvalues and eigenvectors

Parameters:

n - Size of the matrix

upper - True if the upper part of the matrix is stored, and false if the lower part of the matrix is stored instead

SymmPackEVD

public SymmPackEVD(int n,
                   boolean upper,
                   boolean vectors)

Sets up an eigenvalue decomposition for symmetrical, packed matrices

Parameters:

n - Size of the matrix

upper - True if the upper part of the matrix is stored, and false if the lower part of the matrix is stored instead

vectors - True to compute the eigenvectors, false for just the eigenvalues

Method Detail

factorize

public static SymmPackEVD factorize(Matrix A)
                             throws NotConvergedException

Convenience method for computing the full eigenvalue decomposition of the given matrix

Parameters:

A - Matrix to factorize. Upper part extracted, and the matrix is not modified

Returns:

Newly allocated decomposition

Throws:

NotConvergedException

factor

public SymmPackEVD factor(LowerSymmPackMatrix A)
                   throws NotConvergedException

Computes the eigenvalue decomposition of the given matrix

Parameters:

A - Matrix to factorize. Overwritten on return

Returns:

The current eigenvalue decomposition

Throws:

NotConvergedException

factor

public SymmPackEVD factor(UpperSymmPackMatrix A)
                   throws NotConvergedException

Computes the eigenvalue decomposition of the given matrix

Parameters:

A - Matrix to factorize. Overwritten on return

Returns:

The current eigenvalue decomposition

Throws:

NotConvergedException

getEigenvalues

public double[] getEigenvalues()

Gets the eigenvalues (stored in ascending order)

getEigenvectors

public DenseMatrix getEigenvectors()

Gets the eigenvectors, if available

hasEigenvectors

public boolean hasEigenvectors()

True if the eigenvectors have been computed