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.\" $OpenBSD: cproj.3,v 1.1 2010/07/19 12:48:23 millert Exp $
.\"
.\" Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: July 19 2010 $
.Dt CPROJ 3
.Os
.Sh NAME
.Nm cproj ,
.Nm cprojf
.Nd compute projection onto Riemann sphere
.Sh SYNOPSIS
.Fd #include <complex.h>
.Ft double complex
.Fn cproj "double complex z"
.Ft float complex
.Fn cprojf "float complex z"
.Sh DESCRIPTION
The
.Fn cproj
and
.Fn cprojf
functions compute a projection of
.Fa z
onto the Riemann sphere.
.Sh RETURN VALUES
The
.Fn cproj
and
.Fn cprojf
functions return
.Fa z
for all finite complex numbers.
If
.Fa z
has an infinite part (even if the other part is NaN),
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
and
.Fn cprojf
functions conform to
.St -isoC-99 .
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