matrix.c File Reference

#include <stdio.h>
#include <math.h>
#include <unistd.h>
#include <grass/gis.h>
#include <grass/interpf.h>
#include <grass/gmath.h>

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Functions
int	IL_matrix_create (struct interp_params *params, struct triple *points, int n_points, double **matrix, int *indx)
	Creates system of linear equations from interpolated points. More...

Function Documentation

int IL_matrix_create	(	struct interp_params *	params,
		struct triple *	points,
		int	n_points,
		double **	matrix,
		int *	indx
	)

Creates system of linear equations from interpolated points.

Author

Lubos Mitas (original program and various modifications)

H. Mitasova, I. Kosinovsky, D. Gerdes, D. McCauley (GRASS4.1 version of the program and GRASS4.2 modifications)

L. Mitas, H. Mitasova, I. Kosinovsky, D.Gerdes, D. McCauley (1993, 1995)

modified by McCauley in August 1995

modified by Mitasova in August 1995, Nov. 1996

Copyright

(C) 1993-1996 by Lubos Mitas and the GRASS Development Team

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Creates system of linear equations represented by matrix using given points and interpolating function interp()

Parameters

	params	struct interp_params *
	points	points for interpolation as struct triple
	n_points	number of points
[out]	matrix	the matrix
	indx

Returns

-1 on failure, 1 on success

Definition at line 53 of file matrix.c.

References amax1(), interp_params::fi, G_alloc_vector(), G_debug(), G_ludcmp(), interp_params::interp, interp_params::KMAX2, l, NULL, r, interp_params::rsm, interp_params::scalex, triple::sm, interp_params::theta, triple::x, and triple::y.