1 /*
2 Copyright (C) 2018 Fredrik Johansson
3
4 This file is part of Arb.
5
6 Arb is free software: you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version. See <http://www.gnu.org/licenses/>.
10 */
11
12 #include "acb.h"
13
14 void
acb_real_sqrtpos(acb_t res,const acb_t z,int analytic,slong prec)15 acb_real_sqrtpos(acb_t res, const acb_t z, int analytic, slong prec)
16 {
17 if (arb_is_zero(acb_imagref(z)) && !analytic)
18 {
19 arb_sqrtpos(acb_realref(res), acb_realref(z), prec);
20 arb_zero(acb_imagref(res));
21 }
22 else if (arb_is_positive(acb_realref(z)) || !arb_contains_zero(acb_imagref(z)))
23 {
24 acb_sqrt(res, z, prec);
25 }
26 else
27 {
28 acb_indeterminate(res);
29 }
30 }
31
32