mirror of
https://github.com/vale981/arb
synced 2025-03-04 17:01:40 -05:00
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/*
|
|
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_poly.h"
|
|
|
|
void
|
|
_acb_poly_sinc_series(acb_ptr g, acb_srcptr h, slong hlen, slong n, slong prec)
|
|
{
|
|
hlen = FLINT_MIN(hlen, n);
|
|
|
|
if (hlen == 1)
|
|
{
|
|
acb_sinc(g, h, prec);
|
|
_acb_vec_zero(g + 1, n - 1);
|
|
}
|
|
else
|
|
{
|
|
acb_ptr t, u;
|
|
|
|
t = _acb_vec_init(n + 1);
|
|
u = _acb_vec_init(hlen);
|
|
|
|
_acb_vec_set(u, h, hlen);
|
|
|
|
if (acb_is_zero(h))
|
|
{
|
|
_acb_poly_sin_series(t, u, hlen, n + 1, prec);
|
|
_acb_poly_div_series(g, t + 1, n, u + 1, hlen - 1, n, prec);
|
|
}
|
|
else
|
|
{
|
|
_acb_poly_sin_series(t, u, hlen, n, prec);
|
|
_acb_poly_div_series(g, t, n, u, hlen, n, prec);
|
|
}
|
|
|
|
_acb_vec_clear(t, n + 1);
|
|
_acb_vec_clear(u, hlen);
|
|
}
|
|
}
|
|
|
|
void
|
|
acb_poly_sinc_series(acb_poly_t g, const acb_poly_t h, slong n, slong prec)
|
|
{
|
|
slong hlen = h->length;
|
|
|
|
if (n == 0)
|
|
{
|
|
acb_poly_zero(g);
|
|
return;
|
|
}
|
|
|
|
if (hlen == 0)
|
|
{
|
|
acb_poly_one(g);
|
|
return;
|
|
}
|
|
|
|
if (hlen == 1)
|
|
n = 1;
|
|
|
|
acb_poly_fit_length(g, n);
|
|
_acb_poly_sinc_series(g->coeffs, h->coeffs, hlen, n, prec);
|
|
_acb_poly_set_length(g, n);
|
|
_acb_poly_normalise(g);
|
|
}
|
|
|