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https://github.com/vale981/arb
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58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
/*
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Copyright (C) 2018 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 "mag.h"
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void
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mag_cosh(mag_t res, const mag_t x)
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{
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if (mag_is_zero(x))
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{
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mag_one(res);
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}
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else if (mag_is_inf(x))
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{
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mag_inf(res);
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}
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else
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{
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mag_t t;
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mag_init(t);
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mag_exp(t, x);
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mag_expinv(res, x);
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mag_add(res, res, t);
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mag_mul_2exp_si(res, res, -1);
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mag_clear(t);
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}
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}
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void
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mag_cosh_lower(mag_t res, const mag_t x)
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{
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if (mag_is_zero(x))
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{
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mag_one(res);
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}
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else if (mag_is_inf(x))
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{
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mag_inf(res);
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}
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else
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{
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mag_t t;
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mag_init(t);
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mag_exp_lower(t, x);
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mag_expinv_lower(res, x);
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mag_add_lower(res, res, t);
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mag_mul_2exp_si(res, res, -1);
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mag_clear(t);
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}
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}
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