mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
87 lines
2.4 KiB
C
87 lines
2.4 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 "arb_poly.h"
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void
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_arb_poly_evaluate2_acb_horner(acb_t y, acb_t z,
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arb_srcptr poly, slong len, const acb_t x, slong prec)
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{
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if (len == 0)
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{
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acb_zero(y);
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acb_zero(z);
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}
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else if (len == 1)
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{
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acb_set_round_arb(y, poly + 0, prec);
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acb_zero(z);
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}
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else if (acb_is_zero(x))
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{
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acb_set_round_arb(y, poly + 0, prec);
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acb_set_round_arb(z, poly + 1, prec);
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}
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else if (len == 2)
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{
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acb_mul_arb(y, x, poly + 1, prec);
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acb_add_arb(y, y, poly + 0, prec);
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acb_set_round_arb(z, poly + 1, prec);
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}
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else
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{
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acb_t t, u, v;
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slong i;
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acb_init(t);
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acb_init(u);
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acb_init(v);
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acb_set_round_arb(u, poly + len - 1, prec);
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acb_zero(v);
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for (i = len - 2; i >= 0; i--)
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{
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acb_mul(t, v, x, prec);
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acb_add(v, u, t, prec);
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acb_mul(t, u, x, prec);
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acb_add_arb(u, t, poly + i, prec);
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}
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acb_swap(y, u);
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acb_swap(z, v);
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acb_clear(t);
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acb_clear(u);
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acb_clear(v);
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}
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}
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void
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arb_poly_evaluate2_acb_horner(acb_t r, acb_t s, const arb_poly_t f, const acb_t a, slong prec)
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{
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_arb_poly_evaluate2_acb_horner(r, s, f->coeffs, f->length, a, prec);
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}
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