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/*
Copyright (C) 2011 Sebastian Pancratz
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_mod_poly.h"
void fmpz_mod_poly_make_monic(fmpz_mod_poly_t res, const fmpz_mod_poly_t poly,
const fmpz_mod_ctx_t ctx)
{
const slong len = poly->length;
fmpz_t inv;
if (len == 0)
{
fmpz_mod_poly_zero(res, ctx);
return;
}
fmpz_init(inv);
fmpz_invmod(inv, fmpz_mod_poly_lead(poly, ctx), fmpz_mod_ctx_modulus(ctx));
fmpz_mod_poly_fit_length(res, len, ctx);
_fmpz_mod_poly_set_length(res, len);
_fmpz_mod_poly_scalar_mul_fmpz(res->coeffs, poly->coeffs, len, inv, ctx);
fmpz_clear(inv);
}