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/*
Copyright (C) 2016 Fredrik Johansson
This file is part of Arb.
Arb 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 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "arb_poly.h"
void
arb_poly_sub_series(arb_poly_t res, const arb_poly_t poly1,
const arb_poly_t poly2, slong len, slong prec)
{
slong len1, len2;
len1 = poly1->length;
len2 = poly2->length;
len1 = FLINT_MIN(len1, len);
len2 = FLINT_MIN(len2, len);
len = FLINT_MAX(len1, len2);
arb_poly_fit_length(res, len);
_arb_poly_sub(res->coeffs, poly1->coeffs, len1, poly2->coeffs, len2, prec);
_arb_poly_set_length(res, len);
_arb_poly_normalise(res);
}
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