bijnum
Class BIJJacobi

java.lang.Object
  bijnum.BIJJacobi

public class BIJJacobi
extends java.lang.Object

This class implements the jacobi function as a Java class. Redesigned to be faster, for float. Internal calculations are still double though. From Press et al., 2nd ed., Numerical Solutions in C.

See Also:

for the original sources which I kept to be sure because they worked. Copyright (c) 1999-2003, Michael Abramoff. All rights reserved.

Field Summary

float[][]	a The matrix of which you want to compute E.
float[]	eigenvalues
float[][]	eigenvectors

Constructor Summary

BIJJacobi(float[][] m)
Create new instance to compute eigenvectors, eigenvalues.

BIJJacobi(float[][] m, boolean doFeedback)
Create new instance to compute eigenvectors, eigenvalues.

Method Summary

void	compute() Compute all eigenvalues and eigenvectors of a real symmetric matrix a[N][N].
int	nrot()
void	sort() Sort the eigenvalues/eigenvectors on the basis of the eigenvalues, largest first.
int	sweeps()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

a

public float[][] a

The matrix of which you want to compute E.

eigenvectors

public float[][] eigenvectors

eigenvalues

public float[] eigenvalues

Constructor Detail

BIJJacobi

public BIJJacobi(float[][] m,
                 boolean doFeedback)

Create new instance to compute eigenvectors, eigenvalues.

Parameters:

m - a real, symmetric matrix of nxn.

doFeedback, - whether a progress routine should be called after each sweep (only for user interaction).

BIJJacobi

public BIJJacobi(float[][] m)

Create new instance to compute eigenvectors, eigenvalues.

Parameters:

m - a real symmetric matrix of NxN.

Method Detail

compute

public void compute()

Compute all eigenvalues and eigenvectors of a real symmetric matrix a[N][N]. Will destroy a!. The eigenvalues/eigenvectors can be obtained from the corresponding public variables. From: Press et al., Numerical Recipes in C, 2nd ed., pp 467-

sort

public void sort()

Sort the eigenvalues/eigenvectors on the basis of the eigenvalues, largest first. Straight insertion method.

nrot

public int nrot()

sweeps

public int sweeps()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object