1.\" $OpenBSD: cproj.3,v 1.4 2013/11/03 18:28:27 martynas Exp $ 2.\" 3.\" Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: November 3 2013 $ 18.Dt CPROJ 3 19.Os 20.Sh NAME 21.Nm cproj , 22.Nm cprojf , 23.Nm cprojl 24.Nd compute projection onto Riemann sphere 25.Sh SYNOPSIS 26.In complex.h 27.Ft double complex 28.Fn cproj "double complex z" 29.Ft float complex 30.Fn cprojf "float complex z" 31.Ft long double complex 32.Fn cprojl "long double complex z" 33.Sh DESCRIPTION 34The 35.Fn cproj , 36.Fn cprojf 37and 38.Fn cprojl 39functions compute a projection of 40.Fa z 41onto the Riemann sphere. 42.Sh RETURN VALUES 43The 44.Fn cproj , 45.Fn cprojf 46and 47.Fn cprojl 48functions return 49.Fa z 50for all finite complex numbers. 51If 52.Fa z 53has an infinite part (even if the other part is \*(Na), 54they return the equivalent of: 55.Bd -literal -offset indent 56INFINITY + I * copysign(0.0, cimag(z)) 57.Ed 58.Sh SEE ALSO 59.Xr cimag 3 60.Sh STANDARDS 61The 62.Fn cproj , 63.Fn cprojf 64and 65.Fn cprojl 66functions conform to 67.St -isoC-99 . 68