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https://github.com/vale981/arb
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48 lines
1.3 KiB
C
48 lines
1.3 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 "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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