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/*
Copyright (C) 2012 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 "arb_poly.h"
void
_arb_poly_derivative(arb_ptr res, arb_srcptr poly, slong len, slong prec)
{
slong i;
for (i = 1; i < len; i++)
arb_mul_ui(res + i - 1, poly + i, i, prec);
}
void
arb_poly_derivative(arb_poly_t res, const arb_poly_t poly, slong prec)
{
slong len = poly->length;
if (len < 2)
{
arb_poly_zero(res);
}
else
{
arb_poly_fit_length(res, len - 1);
_arb_poly_derivative(res->coeffs, poly->coeffs, len, prec);
_arb_poly_set_length(res, len - 1);
}
}