pqc/external/flint-2.4.3/nmod_poly_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) 2011 Fredrik Johansson
******************************************************************************/
#include "flint.h"
#include "nmod_poly.h"
#include "nmod_poly_mat.h"
slong
nmod_poly_mat_rank(const nmod_poly_mat_t A)
{
nmod_poly_mat_t tmp;
nmod_poly_t den;
slong rank;
if (nmod_poly_mat_is_empty(A))
return 0;
nmod_poly_mat_init_set(tmp, A);
nmod_poly_init(den, nmod_poly_mat_modulus(A));
rank = nmod_poly_mat_fflu(tmp, den, NULL, tmp, 0);
nmod_poly_mat_clear(tmp);
nmod_poly_clear(den);
return rank;
}