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https://github.com/VK3FNG/soundmodem.git
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62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
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/*
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* Matrix operations library
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*
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* Copyright (C) 1999-2000
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* Thomas Sailer, <sailer@ife.ee.ethz.ch>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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/* AIX requires this to be the first thing in the file. */
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#ifndef __GNUC__
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# if HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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# ifdef _AIX
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#pragma alloca
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# else
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# ifndef alloca /* predefined by HP cc +Olibcalls */
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char *alloca ();
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# endif
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# endif
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# endif
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#endif
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#include <string.h>
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#include "mat.h"
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/* c el R^{d1 x d3}, a el R^{d1 x d2}, b el R^{d2 x d3} */
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void frmul(float *c, const float *a, const float *b, unsigned int d1, unsigned int d2, unsigned int d3)
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{
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float *r = c, s;
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unsigned int i, j, k;
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if (c == a || c == b)
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r = alloca(d1 * d3 * sizeof(r[0]));
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for (i = 0; i < d1; i++)
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for (k = 0; k < d3; k++) {
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for (s = 0, j = 0; j < d2; j++)
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s += a[i*d2+j] * b[j*d3+k];
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r[i*d3+k] = s;
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}
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if (r != c)
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memcpy(c, r, d1 * d3 * sizeof(c[0]));
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}
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