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/*
Copyright (C) 2010 Sebastian Pancratz
Copyright (C) 2021 Mathieu Gouttenoire
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_poly.h"
#include "fmpq_poly.h"
void _fmpq_poly_derivative(fmpz * rpoly, fmpz_t rden,
const fmpz * poly, const fmpz_t den, slong len)
{
_fmpz_poly_derivative(rpoly, poly, len);
fmpz_set(rden, den);
_fmpq_poly_canonicalise(rpoly, rden, len - 1);
}
void fmpq_poly_derivative(fmpq_poly_t res, const fmpq_poly_t poly)
{
slong len = poly->length;
if (len < 2)
{
fmpq_poly_zero(res);
return;
}
fmpq_poly_fit_length(res, len - 1);
_fmpq_poly_derivative(res->coeffs, res->den, poly->coeffs, poly->den, len);
_fmpq_poly_set_length(res, len - 1);
}