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https://github.com/vale981/arb
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49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/*
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Copyright (C) 2013 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 "arb_poly.h"
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void
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_arb_poly_binomial_transform(arb_ptr b, arb_srcptr a, slong alen, slong len, slong prec)
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{
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if (alen < 10 || len < 10)
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_arb_poly_binomial_transform_basecase(b, a, alen, len, prec);
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else
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_arb_poly_binomial_transform_convolution(b, a, alen, len, prec);
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}
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void
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arb_poly_binomial_transform(arb_poly_t b, const arb_poly_t a, slong len, slong prec)
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{
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if (len == 0 || a->length == 0)
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{
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arb_poly_zero(b);
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return;
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}
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if (b == a)
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{
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arb_poly_t c;
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arb_poly_init2(c, len);
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_arb_poly_binomial_transform(c->coeffs, a->coeffs, a->length, len, prec);
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arb_poly_swap(b, c);
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arb_poly_clear(c);
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}
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else
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{
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arb_poly_fit_length(b, len);
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_arb_poly_binomial_transform(b->coeffs, a->coeffs, a->length, len, prec);
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}
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_arb_poly_set_length(b, len);
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_arb_poly_normalise(b);
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}
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