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36 lines
997 B
C
36 lines
997 B
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_hypgeom.h"
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int
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acb_hypgeom_u_use_asymp(const acb_t z, slong prec)
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{
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double x, y;
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if ((arf_cmpabs_2exp_si(arb_midref(acb_realref(z)), 0) < 0 &&
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arf_cmpabs_2exp_si(arb_midref(acb_imagref(z)), 0) < 0))
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{
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return 0;
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}
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if ((arf_cmpabs_2exp_si(arb_midref(acb_realref(z)), 64) > 0 ||
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arf_cmpabs_2exp_si(arb_midref(acb_imagref(z)), 64) > 0))
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{
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return 1;
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}
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x = arf_get_d(arb_midref(acb_realref(z)), ARF_RND_DOWN);
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y = arf_get_d(arb_midref(acb_imagref(z)), ARF_RND_DOWN);
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return sqrt(x * x + y * y) > prec * 0.69314718055994530942;
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}
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