1 /* mpc_proj -- projection of a complex number onto the Riemann sphere. 2 3 Copyright (C) 2008, 2009, 2011 INRIA 4 5 This file is part of GNU MPC. 6 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. 11 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 15 more details. 16 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/ . 19 */ 20 21 #include "mpc-impl.h" 22 23 int 24 mpc_proj (mpc_ptr a, mpc_srcptr b, mpc_rnd_t rnd) 25 { 26 if (mpc_inf_p (b)) { 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); 31 } 32 else 33 return mpc_set (a, b, rnd); 34 } 35