pqc/external/flint-2.4.3/fmpq_mat/rref_fraction_free.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 "fmpq_mat.h"
slong
fmpq_mat_rref_fraction_free(fmpq_mat_t B, const fmpq_mat_t A)
{
fmpz_mat_t Aclear;
fmpz_t den;
slong rank;
if (fmpq_mat_is_empty(A))
return 0;
fmpz_mat_init(Aclear, A->r, A->c);
fmpq_mat_get_fmpz_mat_rowwise(Aclear, NULL, A);
fmpz_init(den);
rank = fmpz_mat_rref(Aclear, den, Aclear);
if (rank == 0)
fmpq_mat_zero(B);
else
fmpq_mat_set_fmpz_mat_div_fmpz(B, Aclear, den);
fmpz_mat_clear(Aclear);
fmpz_clear(den);
return rank;
}