GRASS GIS 8 Programmer's Manual 8.3.2(2024)-exported
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mmul.c
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1/* mmul.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 "ccmath.h"
9void mmul(double *c, double *a, double *b, int n)
10{
11 double *p, *q, s;
12
13 int i, j, k;
14
15 trnm(b, n);
16 for (i = 0; i < n; ++i, a += n) {
17 for (j = 0, q = b; j < n; ++j) {
18 for (k = 0, p = a, s = 0.; k < n; ++k)
19 s += *p++ * *q++;
20 *c++ = s;
21 }
22 }
23 trnm(b, n);
24}
void trnm(double *a, int n)
Definition trnm.c:8
double b
void mmul(double *c, double *a, double *b, int n)
Definition mmul.c:9