mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
88 lines
2.3 KiB
C
88 lines
2.3 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) 2016 Fredrik Johansson
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******************************************************************************/
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#include "arb_poly.h"
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void
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_arb_poly_sinc_series(arb_ptr g, arb_srcptr h, slong hlen, slong n, slong prec)
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{
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hlen = FLINT_MIN(hlen, n);
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if (hlen == 1)
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{
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arb_sinc(g, h, prec);
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_arb_vec_zero(g + 1, n - 1);
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}
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else
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{
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arb_ptr t, u;
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t = _arb_vec_init(n + 1);
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u = _arb_vec_init(hlen);
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_arb_vec_set(u, h, hlen);
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if (arb_is_zero(h))
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{
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_arb_poly_sin_series(t, u, hlen, n + 1, prec);
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_arb_poly_div_series(g, t + 1, n, u + 1, hlen - 1, n, prec);
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}
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else
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{
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_arb_poly_sin_series(t, u, hlen, n, prec);
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_arb_poly_div_series(g, t, n, u, hlen, n, prec);
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}
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_arb_vec_clear(t, n + 1);
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_arb_vec_clear(u, hlen);
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}
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}
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void
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arb_poly_sinc_series(arb_poly_t g, const arb_poly_t h, slong n, slong prec)
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{
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slong hlen = h->length;
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if (n == 0)
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{
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arb_poly_zero(g);
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return;
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}
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if (hlen == 0)
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{
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arb_poly_one(g);
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return;
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}
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if (hlen == 1)
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n = 1;
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arb_poly_fit_length(g, n);
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_arb_poly_sinc_series(g->coeffs, h->coeffs, hlen, n, prec);
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_arb_poly_set_length(g, n);
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_arb_poly_normalise(g);
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}
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