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https://github.com/vale981/arb
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38 lines
927 B
C
38 lines
927 B
C
/*
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Copyright (C) 2012 Fredrik Johansson
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This file is part of Arb.
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Arb is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "acb_poly.h"
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void
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_acb_poly_derivative(acb_ptr res, acb_srcptr poly, slong len, slong prec)
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{
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slong i;
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for (i = 1; i < len; i++)
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acb_mul_ui(res + i - 1, poly + i, i, prec);
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}
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void
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acb_poly_derivative(acb_poly_t res, const acb_poly_t poly, slong prec)
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{
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slong len = poly->length;
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if (len < 2)
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{
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acb_poly_zero(res);
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}
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else
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{
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acb_poly_fit_length(res, len - 1);
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_acb_poly_derivative(res->coeffs, poly->coeffs, len, prec);
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_acb_poly_set_length(res, len - 1);
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}
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}
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