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/*
* Matrix operations library
*
* Copyright (C) 1999-2000
* Thomas Sailer, <sailer@ife.ee.ethz.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* AIX requires this to be the first thing in the file. */
#ifndef __GNUC__
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
#include "mat.h"
cplxfloat_t fcdet(const cplxfloat_t *c, unsigned int d)
{
cplxfloat_t *c2;
unsigned int i, j, k, l;
cplxfloat_t det, dr;
cplx(det, 0, 0);
if (!d)
return det;
if (d == 1)
return c[0];
if (d == 2) {
cmul(det, c[0], c[3]);
cmsub(det, c[1], c[2]);
return det;
}
c2 = alloca(sizeof(cplxfloat_t)*(d-1)*(d-1));
for (i = 0; i < d; i++) {
for (j = k = 0; j < d; j++) {
if (j == i)
continue;
for (l = 0; l < d-1; l++)
c2[l*(d-1)+k] = c[(l+1)*d+j];
k++;
}
dr = fcdet(c2, d-1);
if (i & 1)
cmsub(det, dr, c[i]);
else
cmac(det, dr, c[i]);
}
return det;
}
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