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48 lines
954 B
C
48 lines
954 B
C
/*
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Copyright (C) 2015 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_geom_series(mag_t res, const mag_t x, ulong n)
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{
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if (mag_is_zero(x))
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{
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if (n == 0)
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mag_one(res);
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else
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mag_zero(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_one(t);
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mag_sub_lower(t, t, x);
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if (mag_is_zero(t))
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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_pow_ui(res, x, n);
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mag_div(res, res, t);
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}
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mag_clear(t);
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}
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}
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