svd.c File Reference

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

Include dependency graph for svd.c:

Go to the source code of this file.

Macros
#define	PYTHAG(a, b)
#define	MAX(a, b)
#define	SIGN(a, b)   ((b) >= 0.0 ? fabs(a) : -fabs(a))
#define	TOL   1e-8

Functions
int	G_svdcmp (double **a, int m, int n, double *w, double **v)
int	G_svbksb (double **u, double w[], double **v, int m, int n, double b[], double x[])
int	G_svelim (double *w, int n)

Macro Definition Documentation

#define MAX	(		a,
			b
	)

Value:

(maxarg1=(a),maxarg2=(b),(maxarg1) > (maxarg2) ?\
        (maxarg1) : (maxarg2))

Definition at line 12 of file svd.c.

Referenced by G_svdcmp().

#define PYTHAG	(		a,
			b
	)

Value:

((at=fabs(a)) > (bt=fabs(b)) ? \
    (ct=bt/at,at*sqrt(1.0+ct*ct)) : (bt ? (ct=at/bt,bt*sqrt(1.0+ct*ct)): 0.0))

Definition at line 7 of file svd.c.

Referenced by G_svdcmp().

#define SIGN	(		a,
			b
	)		((b) >= 0.0 ? fabs(a) : -fabs(a))

Definition at line 14 of file svd.c.

Referenced by G_svdcmp().

#define TOL   1e-8

Definition at line 264 of file svd.c.

Referenced by G_svelim().

Function Documentation

int G_svbksb	(	double **	u,
		double	w[],
		double **	v,
		int	m,
		int	n,
		double	b[],
		double	x[]
	)

Definition at line 237 of file svd.c.

References G_alloc_vector(), G_free_vector(), n, and dialogs::s.

int G_svdcmp	(	double **	a,
		int	m,
		int	n,
		double *	w,
		double **	v
	)

Definition at line 16 of file svd.c.

References tools::flag, g, G_alloc_vector(), G_free_vector(), dialogs::h, MAX, n, PYTHAG, dialogs::s, SIGN, and y.

int G_svelim	(	double *	w,
		int	n
	)

Definition at line 266 of file svd.c.

References n, and TOL.