mirror of
https://github.com/vale981/arb
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54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/*
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Copyright (C) 2021 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_hypgeom.h"
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#include "acb_hypgeom.h"
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void
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acb_hypgeom_rising_ui_rec(acb_t res, const acb_t x, ulong n, slong prec)
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{
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if (n <= 1)
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{
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if (n == 0)
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acb_one(res);
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else
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acb_set_round(res, x, prec);
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return;
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}
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if (arb_is_zero(acb_imagref(x)))
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{
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arb_hypgeom_rising_ui_rec(acb_realref(res), acb_realref(x), n, prec);
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arb_zero(acb_imagref(res));
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return;
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}
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if (n == 2 && prec <= 1024)
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{
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if (res != x)
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acb_set(res, x);
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acb_addmul(res, x, x, prec);
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return;
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}
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if (n <= 5 && prec <= 512)
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{
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acb_hypgeom_rising_ui_forward(res, x, n, prec);
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}
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else
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{
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if (n >= 20 && acb_bits(x) < prec / 8)
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acb_hypgeom_rising_ui_bs(res, x, n, prec);
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else
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acb_hypgeom_rising_ui_rs(res, x, n, 0, prec);
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}
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}
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