pqc/external/flint-2.4.3/nmod_mat/rank.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT 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.
FLINT 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 FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2010 Fredrik Johansson
******************************************************************************/
#include <stdlib.h>
#include "flint.h"
#include "ulong_extras.h"
#include "nmod_vec.h"
#include "nmod_mat.h"
slong
nmod_mat_rank(const nmod_mat_t A)
{
slong m, n, rank;
slong * perm;
nmod_mat_t tmp;
m = A->r;
n = A->c;
if (m == 0 || n == 0)
return 0;
nmod_mat_init_set(tmp, A);
perm = flint_malloc(sizeof(slong) * m);
rank = nmod_mat_lu(perm, tmp, 0);
flint_free(perm);
nmod_mat_clear(tmp);
return rank;
}