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/*
Copyright (C) 2011 Fredrik Johansson
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpz_poly.h"
#include "fmpz_poly_mat.h"
#include "perm.h"
void
fmpz_poly_mat_det_fflu(fmpz_poly_t det, const fmpz_poly_mat_t A)
{
slong n = fmpz_poly_mat_nrows(A);
if (n == 0)
fmpz_poly_one(det);
else
{
fmpz_poly_mat_t tmp;
slong * perm;
fmpz_poly_mat_init_set(tmp, A);
perm = _perm_init(n);
fmpz_poly_mat_fflu(tmp, det, perm, tmp, 1);
if (_perm_parity(perm, n))
fmpz_poly_neg(det, det);
_perm_clear(perm);
fmpz_poly_mat_clear(tmp);
}
}