mirror of
https://github.com/vale981/arb
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53 lines
1.1 KiB
C
53 lines
1.1 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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void
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arb_hypgeom_gamma_upper_integration(arb_t res, const arb_t s,
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const arb_t z, int regularized, slong prec)
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{
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arb_t t, u;
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arb_init(t);
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arb_init(u);
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arb_one(t);
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arb_add_ui(u, s, 1, prec);
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arb_hypgeom_u_integration(u, t, u, z, prec);
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if (arb_is_finite(u))
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{
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if (regularized != 2)
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{
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arb_pow(t, z, s, prec);
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arb_mul(u, u, t, prec);
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if (regularized == 1)
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{
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arb_rgamma(t, s, prec);
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arb_mul(u, u, t, prec);
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}
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}
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arb_neg(t, z);
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arb_exp(t, t, prec);
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arb_mul(res, t, u, prec);
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}
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else
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{
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arb_indeterminate(res);
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}
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arb_clear(t);
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arb_clear(u);
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}
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