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/*
Copyright (C) 2016 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 "acb_hypgeom.h"
void
_acb_hypgeom_erfi_series(acb_ptr g, acb_srcptr h, slong hlen, slong len, slong prec)
{
hlen = FLINT_MIN(hlen, len);
if (hlen == 1)
{
acb_hypgeom_erfi(g, h, prec);
_acb_vec_zero(g + 1, len - 1);
}
else
{
slong k;
acb_ptr t = _acb_vec_init(hlen);
for (k = 0; k < hlen; k++)
acb_mul_onei(t + k, h + k);
_acb_hypgeom_erf_series(g, t, hlen, len, prec);
for (k = 0; k < len; k++)
acb_div_onei(g + k, g + k);
_acb_vec_clear(t, hlen);
}
}
void
acb_hypgeom_erfi_series(acb_poly_t g, const acb_poly_t h, slong len, slong prec)
{
slong hlen = h->length;
if (hlen == 0 || len == 0)
{
acb_poly_zero(g);
return;
}
acb_poly_fit_length(g, len);
_acb_hypgeom_erfi_series(g->coeffs, h->coeffs, hlen, len, prec);
_acb_poly_set_length(g, len);
_acb_poly_normalise(g);
}
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