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https://github.com/vale981/arb
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57 lines
1.7 KiB
C
57 lines
1.7 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_poly.h"
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/* series expansion for log(gamma(1-x)) at x = 0 */
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void
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fmprb_poly_log_gamma_series(fmprb_poly_t z, long n, long prec)
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{
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long i;
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fmprb_poly_fit_length(z, n);
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_fmprb_poly_set_length(z, n);
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for (i = 0; i < n; i++)
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{
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if (i == 0)
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{
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fmprb_zero(z->coeffs + i);
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}
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else if (i == 1)
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{
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fmprb_const_euler_brent_mcmillan(z->coeffs + i, prec);
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}
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else
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{
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fmprb_zeta_ui(z->coeffs + i, i, prec);
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fmprb_div_ui(z->coeffs + i, z->coeffs + i, i, prec);
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}
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}
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_fmprb_poly_normalise(z);
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}
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