GRASS GIS 8 Programmer's Manual 8.3.2(2024)-exported
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rmmult.c
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1/* rmmult.c CCMATH mathematics library source code.
2 *
3 * Copyright (C) 2000 Daniel A. Atkinson All rights reserved.
4 * This code may be redistributed under the terms of the GNU library
5 * public license (LGPL). ( See the lgpl.license file for details.)
6 * ------------------------------------------------------------------------
7 */
8#include <stdlib.h>
9void rmmult(double *rm, double *a, double *b, int n, int m, int l)
10{
11 double z, *q0, *p, *q;
12
13 int i, j, k;
14
15 q0 = (double *)calloc(m, sizeof(double));
16 for (i = 0; i < l; ++i, ++rm) {
17 for (k = 0, p = b + i; k < m; p += l)
18 q0[k++] = *p;
19 for (j = 0, p = a, q = rm; j < n; ++j, q += l) {
20 for (k = 0, z = 0.; k < m;)
21 z += *p++ * q0[k++];
22 *q = z;
23 }
24 }
25 free(q0);
26}
double b
double l
void rmmult(double *rm, double *a, double *b, int n, int m, int l)
Definition rmmult.c:9