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.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\"
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" Distributed under GPL
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.\" %%%LICENSE_END
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.\"
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.TH CPROJ 3 2015-04-19 "" "Linux Programmer's Manual"
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.SH NAME
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cproj, cprojf, cprojl \- project into Riemann Sphere
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.SH SYNOPSIS
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.B #include <complex.h>
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.PP
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.BI "double complex cproj(double complex " z ");"
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.br
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.BI "float complex cprojf(float complex " z ");"
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.br
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.BI "long double complex cprojl(long double complex " z ");"
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.PP
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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These functions project a point in the plane onto the surface of a
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Riemann Sphere, the one-point compactification of the complex plane.
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Each finite point
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.I z
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projects to
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.I z
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itself.
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Every complex infinite value is projected to a single infinite value,
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namely to positive infinity on the real axis.
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.SH VERSIONS
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These functions first appeared in glibc in version 2.1.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lbw27 lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR cproj (),
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.BR cprojf (),
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.BR cprojl ()
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T} Thread safety MT-Safe
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.TE
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.SH CONFORMING TO
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C99, POSIX.1-2001, POSIX.1-2008.
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.SH NOTES
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In glibc 2.11 and earlier, the implementation does something different
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(a
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.I stereographic
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projection onto a Riemann Sphere).
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.\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=10401
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.SH SEE ALSO
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.BR cabs (3),
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.BR complex (7)
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.SH COLOPHON
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This page is part of release 4.15 of the Linux
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.I man-pages
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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\%https://www.kernel.org/doc/man\-pages/.
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