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https://github.com/vale981/arb
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54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/*=============================================================================
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2012 Fredrik Johansson
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******************************************************************************/
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#include "fmprb.h"
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#include "hypgeom.h"
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void
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fmprb_const_pi_chudnovsky(fmprb_t s, long prec)
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{
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hypgeom_t series;
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fmprb_t t, u;
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fmprb_init(t);
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fmprb_init(u);
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hypgeom_init(series);
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fmpz_poly_set_str(series->A, "2 13591409 545140134");
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fmpz_poly_set_str(series->B, "1 1");
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fmpz_poly_set_str(series->P, "4 5 -46 108 -72");
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fmpz_poly_set_str(series->Q, "4 0 0 0 10939058860032000");
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prec += FLINT_CLOG2(prec);
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fmprb_hypgeom_infsum(s, t, series, prec, prec);
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fmprb_sqrt_ui(u, 640320, prec);
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fmprb_mul_ui(u, u, 640320 / 12, prec);
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fmprb_mul(u, u, t, prec);
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fmprb_div(s, u, s, prec);
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hypgeom_clear(series);
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fmprb_clear(t);
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fmprb_clear(u);
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}
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