eigen.c File Reference

#include <stdlib.h>
#include <grass/gmath.h>
#include <grass/gis.h>

Include dependency graph for eigen.c:

Go to the source code of this file.

Functions
int	eigen (double **M, double **Vectors, double *lambda, int n)
	Computes eigenvalues (and eigen vectors if desired) for symmetric matices.
int	egvorder2 (double *d, double **z, long bands)
	Returns 0.
int	transpose2 (double **eigmat, long bands)
	Returns 0.

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Function Documentation

int egvorder2	(	double *	d,
		double **	z,
		long	bands
	)

Returns 0.

Parameters:

d
z
bands

Returns:

int

Definition at line 71 of file eigen.c.

References G_free().

int eigen	(	double **	M,
		double **	Vectors,
		double *	lambda,
		int	n
	)

Computes eigenvalues (and eigen vectors if desired) for symmetric matices.

Computes eigenvalues (and eigen vectors if desired) for symmetric matices.

Parameters:

M	Input matrix
Vectors	eigen output vector matrix
lambda	Output eigenvalues
n	Input matrix dimension

Returns:

int

Definition at line 26 of file eigen.c.

References G_alloc_matrix(), G_alloc_vector(), G_free_matrix(), G_free_vector(), G_tqli(), and G_tred2().

Referenced by jacobi().

int transpose2	(	double **	eigmat,
		long	bands
	)

Returns 0.

Parameters:

eigmat
bands

Returns:

int

Definition at line 120 of file eigen.c.