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'\" t
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\"
.\" SPDX-License-Identifier: GPL-1.0-or-later
.\"
.TH cproj 3 2022-12-15 "Linux man-pages 6.03"
.SH NAME
cproj, cprojf, cprojl \- project into Riemann Sphere
.SH LIBRARY
Math library
.RI ( libm ", " \-lm )
.SH SYNOPSIS
.nf
.B #include <complex.h>
.PP
.BI "double complex cproj(double complex " z ");"
.BI "float complex cprojf(float complex " z ");"
.BI "long double complex cprojl(long double complex " z ");"
.fi
.SH DESCRIPTION
These functions project a point in the plane onto the surface of a
Riemann Sphere, the one-point compactification of the complex plane.
Each finite point
.I z
projects to
.I z
itself.
Every complex infinite value is projected to a single infinite value,
namely to positive infinity on the real axis.
.SH VERSIONS
These functions were added in glibc 2.1.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.BR cproj (),
.BR cprojf (),
.BR cprojl ()
T} Thread safety MT-Safe
.TE
.hy
.ad
.sp 1
.SH STANDARDS
C99, POSIX.1-2001, POSIX.1-2008.
.SH NOTES
In glibc 2.11 and earlier, the implementation does something different
(a
.I stereographic
projection onto a Riemann Sphere).
.\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=10401
.SH SEE ALSO
.BR cabs (3),
.BR complex (7)
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