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https://github.com/vale981/arb
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75 lines
2.2 KiB
C
75 lines
2.2 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) 2013 Fredrik Johansson
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******************************************************************************/
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#include "gamma.h"
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#include "fmprb_poly.h"
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TLS_PREFIX fmprb_struct * gamma_taylor_coeffs = NULL;
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TLS_PREFIX long gamma_taylor_prec = 0;
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TLS_PREFIX long gamma_taylor_num = 0;
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void
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fmprb_poly_neg(fmprb_poly_t y, const fmprb_poly_t x)
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{
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fmprb_poly_fit_length(y, x->length);
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_fmprb_vec_neg(y->coeffs, x->coeffs, x->length);
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_fmprb_poly_set_length(y, x->length);
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}
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void
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gamma_taylor_precompute(long num, long prec)
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{
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long wp;
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if (gamma_taylor_num < num || gamma_taylor_prec < prec)
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{
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fmprb_poly_t A;
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long i;
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_fmprb_vec_clear(gamma_taylor_coeffs, gamma_taylor_num);
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num = FLINT_MAX(gamma_taylor_num * 1.5, num);
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prec = FLINT_MAX(gamma_taylor_prec * 1.5, prec);
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prec = FLINT_MAX(prec, 64);
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wp = prec * 1.01 + 32;
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/* TODO: cleanup */
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fmprb_poly_init(A);
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fmprb_poly_log_gamma_series(A, num, wp);
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fmprb_poly_neg(A, A);
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fmprb_poly_exp_series(A, A, num, wp);
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for (i = 1; i < num; i += 2)
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fmprb_neg(A->coeffs + i, A->coeffs + i);
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gamma_taylor_coeffs = A->coeffs;
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gamma_taylor_num = A->length;
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gamma_taylor_prec = prec;
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}
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}
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