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https://github.com/vale981/arb
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53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
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Copyright (C) 2014 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.h"
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void
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acb_rising_ui(acb_t y, const acb_t x, ulong n, slong prec)
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{
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if (n < FLINT_MAX(prec, 100))
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{
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acb_rising_ui_rec(y, x, n, prec);
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}
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else
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{
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acb_t t;
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acb_init(t);
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acb_add_ui(t, x, n, prec);
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acb_gamma(t, t, prec);
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acb_rgamma(y, x, prec);
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acb_mul(y, y, t, prec);
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acb_clear(t);
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}
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}
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void
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acb_rising(acb_t y, const acb_t x, const acb_t n, slong prec)
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{
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if (acb_is_int(n) && arf_sgn(arb_midref(acb_realref(n))) >= 0 &&
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arf_cmpabs_ui(arb_midref(acb_realref(n)), FLINT_MAX(prec, 100)) < 0)
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{
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acb_rising_ui_rec(y, x,
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arf_get_si(arb_midref(acb_realref(n)), ARF_RND_DOWN), prec);
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}
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else
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{
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acb_t t;
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acb_init(t);
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acb_add(t, x, n, prec);
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acb_gamma(t, t, prec);
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acb_rgamma(y, x, prec);
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acb_mul(y, y, t, prec);
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acb_clear(t);
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}
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}
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