mirror of
https://github.com/vale981/arb
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46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/*
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Copyright (C) 2011 William Hart
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Copyright (C) 2012 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_div_root(arb_ptr Q, arb_t R, arb_srcptr A,
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slong len, const arb_t c, slong prec)
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{
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arb_t r, t;
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slong i;
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if (len < 2)
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{
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arb_zero(R);
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return;
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}
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arb_init(r);
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arb_init(t);
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arb_set(t, A + len - 2);
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arb_set(Q + len - 2, A + len - 1);
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arb_set(r, Q + len - 2);
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/* TODO: avoid the extra assignments (but still support aliasing) */
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for (i = len - 2; i > 0; i--)
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{
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arb_mul(r, r, c, prec);
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arb_add(r, r, t, prec);
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arb_set(t, A + i - 1);
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arb_set(Q + i - 1, r);
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}
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arb_mul(r, r, c, prec);
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arb_add(R, r, t, prec);
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}
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