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https://github.com/vale981/arb
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48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/*
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Copyright (C) 2016 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_sgn(acb_t res, const acb_t z, slong prec)
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{
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if (arb_is_zero(acb_imagref(z)))
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{
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arb_sgn(acb_realref(res), acb_realref(z));
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arb_zero(acb_imagref(res));
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}
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else if (arb_is_zero(acb_realref(z)))
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{
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arb_sgn(acb_imagref(res), acb_imagref(z));
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arb_zero(acb_realref(res));
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}
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else
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{
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arb_t t;
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arb_init(t);
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acb_abs(t, z, prec);
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arb_inv(t, t, prec);
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if (arb_is_finite(t))
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{
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acb_mul_arb(res, z, t, prec);
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}
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else
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{
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arf_zero(arb_midref(acb_realref(res)));
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mag_one(arb_radref(acb_realref(res)));
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arb_set(acb_imagref(res), acb_realref(res));
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}
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arb_clear(t);
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}
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}
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