.\"	$OpenBSD: cproj.3,v 1.4 2013/11/03 18:28:27 martynas Exp $
.\"
.\" Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
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.Dd $Mdocdate: November 3 2013 $
.Dt CPROJ 3
.Os
.Sh NAME
.Nm cproj ,
.Nm cprojf ,
.Nm cprojl
.Nd compute projection onto Riemann sphere
.Sh SYNOPSIS
.In complex.h
.Ft double complex
.Fn cproj "double complex z"
.Ft float complex
.Fn cprojf "float complex z"
.Ft long double complex
.Fn cprojl "long double complex z"
.Sh DESCRIPTION
The
.Fn cproj ,
.Fn cprojf
and
.Fn cprojl
functions compute a projection of
.Fa z
onto the Riemann sphere.
.Sh RETURN VALUES
The
.Fn cproj ,
.Fn cprojf
and
.Fn cprojl
functions return
.Fa z
for all finite complex numbers.
If
.Fa z
has an infinite part (even if the other part is \*(Na),
they return the equivalent of:
.Bd -literal -offset indent
INFINITY + I * copysign(0.0, cimag(z))
.Ed
.Sh SEE ALSO
.Xr cimag 3
.Sh STANDARDS
The
.Fn cproj ,
.Fn cprojf
and
.Fn cprojl
functions conform to
.St -isoC-99 .