mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
62 lines
1.9 KiB
C
62 lines
1.9 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_taylor_shift_horner(arb_ptr poly, const arb_t c, slong n, slong prec)
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{
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slong i, j;
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if (arb_is_one(c))
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{
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for (i = n - 2; i >= 0; i--)
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for (j = i; j < n - 1; j++)
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arb_add(poly + j, poly + j, poly + j + 1, prec);
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}
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else if (arb_equal_si(c, -1))
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{
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for (i = n - 2; i >= 0; i--)
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for (j = i; j < n - 1; j++)
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arb_sub(poly + j, poly + j, poly + j + 1, prec);
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}
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else if (!arb_is_zero(c))
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{
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for (i = n - 2; i >= 0; i--)
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for (j = i; j < n - 1; j++)
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arb_addmul(poly + j, poly + j + 1, c, prec);
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}
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}
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void
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arb_poly_taylor_shift_horner(arb_poly_t g, const arb_poly_t f,
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const arb_t c, slong prec)
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{
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if (f != g)
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arb_poly_set_round(g, f, prec);
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_arb_poly_taylor_shift_horner(g->coeffs, c, g->length, prec);
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}
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