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28 lines
711 B
C
28 lines
711 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_modular.h"
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void
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acb_modular_elliptic_k(acb_t k, const acb_t m, slong prec)
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{
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acb_t t;
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acb_init(t);
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acb_sub_ui(t, m, 1, prec);
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acb_neg(t, t);
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acb_sqrt(t, t, prec);
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acb_agm1(k, t, prec);
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acb_const_pi(t, prec);
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acb_div(k, t, k, prec);
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acb_mul_2exp_si(k, k, -1);
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acb_clear(t);
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}
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