mirror of
https://github.com/vale981/arb
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45 lines
1 KiB
C
45 lines
1 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_taylor_shift_divconquer(acb_ptr poly, const acb_t c, slong len, slong prec)
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{
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acb_struct d[2];
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if (len <= 1 || acb_is_zero(c))
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return;
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if (len == 2)
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{
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acb_addmul(poly, poly + 1, c, prec);
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return;
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}
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d[0] = *c;
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acb_init(d + 1);
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acb_one(d + 1); /* no need to free */
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_acb_poly_compose_divconquer(poly, poly, len, d, 2, prec);
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}
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void
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acb_poly_taylor_shift_divconquer(acb_poly_t g, const acb_poly_t f,
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const acb_t c, slong prec)
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{
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if (f != g)
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acb_poly_set_round(g, f, prec);
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_acb_poly_taylor_shift_divconquer(g->coeffs, c, g->length, prec);
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}
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