1*8fa80f29Smrg /* mpc_proj -- projection of a complex number onto the Riemann sphere.
2*8fa80f29Smrg
3*8fa80f29Smrg Copyright (C) 2008, 2009, 2011 INRIA
4*8fa80f29Smrg
5*8fa80f29Smrg This file is part of GNU MPC.
6*8fa80f29Smrg
7*8fa80f29Smrg GNU MPC is free software; you can redistribute it and/or modify it under
8*8fa80f29Smrg the terms of the GNU Lesser General Public License as published by the
9*8fa80f29Smrg Free Software Foundation; either version 3 of the License, or (at your
10*8fa80f29Smrg option) any later version.
11*8fa80f29Smrg
12*8fa80f29Smrg GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
13*8fa80f29Smrg WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14*8fa80f29Smrg FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
15*8fa80f29Smrg more details.
16*8fa80f29Smrg
17*8fa80f29Smrg You should have received a copy of the GNU Lesser General Public License
18*8fa80f29Smrg along with this program. If not, see http://www.gnu.org/licenses/ .
19*8fa80f29Smrg */
20*8fa80f29Smrg
21*8fa80f29Smrg #include "mpc-impl.h"
22*8fa80f29Smrg
23*8fa80f29Smrg int
mpc_proj(mpc_ptr a,mpc_srcptr b,mpc_rnd_t rnd)24*8fa80f29Smrg mpc_proj (mpc_ptr a, mpc_srcptr b, mpc_rnd_t rnd)
25*8fa80f29Smrg {
26*8fa80f29Smrg if (mpc_inf_p (b)) {
27*8fa80f29Smrg /* infinities project to +Inf +i* copysign(0.0, cimag(z)) */
28*8fa80f29Smrg mpfr_set_inf (mpc_realref (a), +1);
29*8fa80f29Smrg mpfr_set_zero (mpc_imagref (a), (mpfr_signbit (mpc_imagref (b)) ? -1 : 1));
30*8fa80f29Smrg return MPC_INEX (0, 0);
31*8fa80f29Smrg }
32*8fa80f29Smrg else
33*8fa80f29Smrg return mpc_set (a, b, rnd);
34*8fa80f29Smrg }
35