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/*
Copyright (C) 2013 Fredrik Johansson
This file is part of FLINT.
FLINT 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 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "arb.h"
#include "acb.h"
void
arb_hurwitz_zeta(arb_t res, const arb_t s, const arb_t z, slong prec)
{
if (!arb_contains_si(s, 1) &&
(arb_is_positive(z) ||
(arb_is_int(z) && arb_is_int(s) && arb_is_nonpositive(s))))
{
acb_t a, b, c;
acb_init(a);
acb_init(b);
acb_init(c);
acb_set_arb(a, s);
acb_set_arb(b, z);
acb_hurwitz_zeta(c, a, b, prec);
arb_set(res, acb_realref(c));
acb_clear(a);
acb_clear(b);
acb_clear(c);
}
else
{
arb_indeterminate(res);
}
}