lu.c File Reference

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

Include dependency graph for lu.c:

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Macros
#define	TINY   1.0e-20;

Functions
int	G_ludcmp (double **a, int n, int *indx, double *d)
	LU decomposition.
void	G_lubksb (double **a, int n, int *indx, double b[])
	LU backward substitution.

Macro Definition Documentation

TINY

#define TINY   1.0e-20;

Definition at line 5 of file lu.c.

Referenced by G_ludcmp().

Function Documentation

G_lubksb()

void G_lubksb	(	double **	a,
		int	n,
		int *	indx,
		double	b[] )

LU backward substitution.

Parameters

a	double **
n	int
indx	int *
b	double []

Returns

void

Definition at line 103 of file lu.c.

References b.

Referenced by IL_interp_segments_2d(), IL_interp_segments_2d_parallel(), and IL_resample_interp_segments_2d().

G_ludcmp()

int G_ludcmp	(	double **	a,
		int	n,
		int *	indx,
		double *	d )

LU decomposition.

Parameters

a	double **
n	int
indx	int *
d	double *

Returns

0 on singular matrix, 1 on success

Definition at line 17 of file lu.c.

References FALSE, G_alloc_vector(), G_free_vector(), TINY, and TRUE.

Referenced by IL_matrix_create_alloc().