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