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https://github.com/vale981/arb
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35 lines
847 B
C
35 lines
847 B
C
/*
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Copyright (C) 2013 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 "arb_calc.h"
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void arb_calc_newton_conv_factor(arf_t conv_factor,
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arb_calc_func_t func, void * param,
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const arb_t conv_region, slong prec)
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{
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arb_struct t[3];
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arb_init(t);
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arb_init(t + 1);
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arb_init(t + 2);
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func(t, conv_region, param, 3, prec);
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arb_div(t, t + 2, t + 1, prec);
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arb_mul_2exp_si(t, t, -1);
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arb_get_abs_ubound_arf(conv_factor, t, prec);
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arb_clear(t);
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arb_clear(t + 1);
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arb_clear(t + 2);
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}
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