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