pqc/external/flint-2.4.3/fmpz_mat/det_bareiss.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) 2010,2011 Fredrik Johansson
******************************************************************************/
#include "fmpz_mat.h"
#include "perm.h"
void
_fmpz_mat_det_bareiss(fmpz_t det, fmpz_mat_t tmp)
{
slong *perm, n = fmpz_mat_nrows(tmp);
perm = _perm_init(n);
fmpz_mat_fflu(tmp, det, perm, tmp, 1);
if (_perm_parity(perm, n) == 1)
fmpz_neg(det, det);
_perm_clear(perm);
}
void
fmpz_mat_det_bareiss(fmpz_t det, const fmpz_mat_t A)
{
fmpz_mat_t tmp;
if (A->r < 1)
{
fmpz_one(det);
return;
}
fmpz_mat_init_set(tmp, A);
_fmpz_mat_det_bareiss(det, tmp);
fmpz_mat_clear(tmp);
}