no.uib.cipr.matrix.sparse

Class ArpackSym

java.lang.Object

no.uib.cipr.matrix.sparse.ArpackSym

public class ArpackSym
extends Object

Uses ARPACK to partially solve symmetric eigensystems (ARPACK is designed to compute a subset of eigenvalues/eigenvectors).

Author:

Sam Halliday

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ArpackSym.Ritz

Constructor Summary

Constructors

Constructor and Description
ArpackSym(Matrix matrix)

Method Summary

Methods

Modifier and Type	Method and Description
Map<Double,DenseVectorSub>	solve(int eigenvalues, ArpackSym.Ritz ritz) Solve the eigensystem for the number of eigenvalues requested.

Methods inherited from class java.lang.Object

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

Constructor Detail

ArpackSym

public ArpackSym(Matrix matrix)

Method Detail

solve

public Map<Double,DenseVectorSub> solve(int eigenvalues,
                               ArpackSym.Ritz ritz)

Solve the eigensystem for the number of eigenvalues requested.

NOTE: The references to the eigenvectors will keep alive a reference to a nev * n double array, so use the copy() method to free it up if only a subset is required.

Parameters:

eigenvalues -

ritz - preference for solutions

Returns:

a map from eigenvalues to corresponding eigenvectors.