mirror of
https://github.com/vale981/arb
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43 lines
1,018 B
C
43 lines
1,018 B
C
/*
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Copyright (C) 2013 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_inv_borel_transform(acb_ptr res, acb_srcptr poly, slong len, slong prec)
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{
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slong i;
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arb_t t;
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arb_init(t);
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arb_one(t);
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for (i = 0; i < len; i++)
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{
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if (i > 1)
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arb_mul_ui(t, t, i, prec);
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acb_mul_arb(res + i, poly + i, t, prec);
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}
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arb_clear(t);
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}
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void
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acb_poly_inv_borel_transform(acb_poly_t res, const acb_poly_t poly, slong prec)
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{
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acb_poly_fit_length(res, poly->length);
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_acb_poly_inv_borel_transform(res->coeffs, poly->coeffs, poly->length, prec);
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_acb_poly_set_length(res, poly->length);
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_acb_poly_normalise(res);
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}
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