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/*
Copyright (C) 2011, 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"
void _fmpz_poly_derivative(fmpz * rpoly, const fmpz * poly, slong len)
{
slong i;
for (i = 1; i < len; i++)
fmpz_mul_ui(rpoly + (i - 1), poly + i, i);
}
void fmpz_poly_derivative(fmpz_poly_t res, const fmpz_poly_t poly)
{
const slong len = poly->length;
if (len < 2)
{
fmpz_poly_zero(res);
}
else
{
fmpz_poly_fit_length(res, len - 1);
_fmpz_poly_derivative(res->coeffs, poly->coeffs, len);
_fmpz_poly_set_length(res, len - 1);
}
}