mirror of
https://github.com/vale981/arb
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74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/*
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Copyright (C) 2016 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 "acb_poly.h"
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void
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_acb_poly_sinc_series(acb_ptr g, acb_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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acb_sinc(g, h, prec);
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_acb_vec_zero(g + 1, n - 1);
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}
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else
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{
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acb_ptr t, u;
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t = _acb_vec_init(n + 1);
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u = _acb_vec_init(hlen);
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_acb_vec_set(u, h, hlen);
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if (acb_is_zero(h))
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{
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_acb_poly_sin_series(t, u, hlen, n + 1, prec);
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_acb_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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_acb_poly_sin_series(t, u, hlen, n, prec);
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_acb_poly_div_series(g, t, n, u, hlen, n, prec);
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}
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_acb_vec_clear(t, n + 1);
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_acb_vec_clear(u, hlen);
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}
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}
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void
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acb_poly_sinc_series(acb_poly_t g, const acb_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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acb_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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acb_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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acb_poly_fit_length(g, n);
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_acb_poly_sinc_series(g->coeffs, h->coeffs, hlen, n, prec);
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_acb_poly_set_length(g, n);
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_acb_poly_normalise(g);
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}
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