pqc/external/flint-2.4.3/nmod_poly_mat/solve_fflu.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"
#include "perm.h"
int
nmod_poly_mat_solve_fflu(nmod_poly_mat_t X, nmod_poly_t den,
const nmod_poly_mat_t A, const nmod_poly_mat_t B)
{
nmod_poly_mat_t LU;
slong dim, *perm;
int result;
if (nmod_poly_mat_is_empty(B))
{
nmod_poly_one(den);
return 1;
}
dim = nmod_poly_mat_nrows(A);
perm = _perm_init(dim);
nmod_poly_mat_init_set(LU, A);
result = (nmod_poly_mat_fflu(LU, den, perm, LU, 1) == dim);
if (result)
nmod_poly_mat_solve_fflu_precomp(X, perm, LU, B);
else
nmod_poly_zero(den);
_perm_clear(perm);
nmod_poly_mat_clear(LU);
return result;
}