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/*
Copyright (C) 2012, 2013 Fredrik Johansson
This file is part of Arb.
Arb is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "arb_poly.h"
static void
_arb_poly_rising_ui_series_bsplit(arb_ptr res,
arb_srcptr f, slong flen, ulong a, ulong b,
slong trunc, slong prec)
{
flen = FLINT_MIN(flen, trunc);
if (b - a == 1)
{
arb_add_ui(res, f, a, prec);
_arb_vec_set(res + 1, f + 1, flen - 1);
}
else
{
arb_ptr L, R;
slong len1, len2;
slong m = a + (b - a) / 2;
len1 = poly_pow_length(flen, m - a, trunc);
len2 = poly_pow_length(flen, b - m, trunc);
L = _arb_vec_init(len1 + len2);
R = L + len1;
_arb_poly_rising_ui_series_bsplit(L, f, flen, a, m, trunc, prec);
_arb_poly_rising_ui_series_bsplit(R, f, flen, m, b, trunc, prec);
_arb_poly_mullow(res, L, len1, R, len2,
FLINT_MIN(trunc, len1 + len2 - 1), prec);
_arb_vec_clear(L, len1 + len2);
}
}
void
_arb_poly_rising_ui_series(arb_ptr res,
arb_srcptr f, slong flen, ulong r,
slong trunc, slong prec)
{
if (trunc == 1 || flen == 1)
{
arb_rising_ui(res, f, r, prec);
_arb_vec_zero(res + 1, trunc - 1);
}
else if (trunc == 2)
{
arb_rising2_ui(res, res + 1, f, r, prec);
arb_mul(res + 1, res + 1, f + 1, prec);
}
else
{
_arb_poly_rising_ui_series_bsplit(res, f, flen, 0, r, trunc, prec);
}
}
void
arb_poly_rising_ui_series(arb_poly_t res, const arb_poly_t f, ulong r, slong trunc, slong prec)
{
slong len;
if ((f->length == 0 && r != 0) || trunc == 0)
{
arb_poly_zero(res);
return;
}
if (r == 0)
{
arb_poly_one(res);
return;
}
len = poly_pow_length(f->length, r, trunc);
if (f == res)
{
arb_poly_t tmp;
arb_poly_init(tmp);
arb_poly_rising_ui_series(tmp, f, r, len, prec);
arb_poly_swap(tmp, res);
arb_poly_clear(tmp);
}
else
{
arb_poly_fit_length(res, len);
_arb_poly_rising_ui_series(res->coeffs, f->coeffs, f->length, r, len, prec);
_arb_poly_set_length(res, len);
_arb_poly_normalise(res);
}
}
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