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https://github.com/vale981/arb
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42 lines
963 B
C
42 lines
963 B
C
/*
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Copyright (C) 2016 Pascal Molin
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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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static void
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_acb_unit_root(acb_t res, ulong order, slong prec)
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{
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fmpq_t t;
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fmpq_init(t);
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fmpq_set_si(t, 2, order);
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arb_sin_cos_pi_fmpq(acb_imagref(res), acb_realref(res), t, prec);
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fmpq_clear(t);
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}
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void
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acb_unit_root(acb_t res, ulong order, slong prec)
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{
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switch (order)
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{
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case 1:
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acb_one(res);
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break;
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case 2:
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acb_set_si(res, -1);
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break;
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case 4:
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acb_onei(res);
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break;
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default:
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_acb_unit_root(res, order, prec);
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break;
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}
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}
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