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/*
Copyright (C) 2020 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.h"
#include "fmpz_mod.h"
#include "fmpz_vec.h"
#include "fmpz_mod_mpoly.h"
void
fmpz_mod_mpoly_monic_part(fmpz_mod_mpoly_t res, const fmpz_mod_mpoly_t f, const fmpz_mod_mpoly_ctx_t ctx)
{
if (res != f)
fmpz_mod_mpoly_set(res, f, ctx);
if (fmpz_mod_mpoly_is_zero(res, ctx))
return;
if (fmpz_sgn(res->coeffs) < 0)
fmpz_mod_mpoly_neg(res, res, ctx);
if (!fmpz_is_one(res->coeffs))
{
fmpz_t c;
fmpz_init(c);
_fmpz_vec_content(c, res->coeffs, res->length);
if (!fmpz_is_one(c))
{
fmpz_mod_inv(c, c, ctx->ffinfo);
fmpz_mod_mpoly_scalar_mul_fmpz(res, res, c, ctx);
}
fmpz_clear(c);
}
}