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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 "ca_poly.h"
void
_ca_poly_derivative(ca_ptr res, ca_srcptr poly, slong len, ca_ctx_t ctx)
{
slong i;
for (i = 1; i < len; i++)
ca_mul_ui(res + (i - 1), poly + i, i, ctx);
}
void
ca_poly_derivative(ca_poly_t res, const ca_poly_t poly, ca_ctx_t ctx)
{
slong len = poly->length;
if (len < 2)
{
ca_poly_zero(res, ctx);
}
else
{
ca_poly_fit_length(res, len - 1, ctx);
_ca_poly_derivative(res->coeffs, poly->coeffs, len, ctx);
_ca_poly_set_length(res, len - 1, ctx);
}
}