GRASS GIS 7 Programmer's Manual  7.5.svn(2018)-r73128
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otrma.c
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1 /* otrma.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>
9 void otrma(double *c, double *a, double *b, int n)
10 {
11  double z, *q0, *p, *s, *t;
12 
13  int i, j, k;
14 
15  q0 = (double *)calloc(n, sizeof(double));
16  for (i = 0; i < n; ++i, ++c) {
17  for (j = 0, t = b; j < n; ++j) {
18  for (k = 0, s = a + i * n, z = 0.; k < n; ++k)
19  z += *t++ * *s++;
20  q0[j] = z;
21  }
22  for (j = 0, p = c, t = a; j < n; ++j, p += n) {
23  for (k = 0, s = q0, z = 0.; k < n; ++k)
24  z += *t++ * *s++;
25  *p = z;
26  }
27  }
28  free(q0);
29 }
void free(void *)
double t
Definition: r_raster.c:39
double b
Definition: r_raster.c:39
void otrma(double *at, double *u, double *a, int n)
Definition: otrma.c:9