1CPROJ(3)                   Linux Programmer's Manual                  CPROJ(3)
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NAME

6       cproj, cprojf, cprojl - project into Riemann Sphere
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SYNOPSIS

9       #include <complex.h>
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11       double complex cproj(double complex z);
12       float complex cprojf(float complex z);
13       long double complex cprojl(long double complex z);
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15       Link with -lm.
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DESCRIPTION

18       These functions project a point in the plane onto the surface of a Rie‐
19       mann Sphere, the one-point compactification of the complex plane.  Each
20       finite  point  z projects to z itself.  Every complex infinite value is
21       projected to a single infinite value, namely to  positive  infinity  on
22       the real axis.
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VERSIONS

25       These functions first appeared in glibc in version 2.1.
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ATTRIBUTES

28       For   an   explanation   of   the  terms  used  in  this  section,  see
29       attributes(7).
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31       ┌────────────────────────────┬───────────────┬─────────┐
32       │Interface                   │ Attribute     │ Value   │
33       ├────────────────────────────┼───────────────┼─────────┤
34       │cproj(), cprojf(), cprojl() │ Thread safety │ MT-Safe │
35       └────────────────────────────┴───────────────┴─────────┘

CONFORMING TO

37       C99, POSIX.1-2001, POSIX.1-2008.
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NOTES

40       In glibc 2.11 and earlier, the implementation does something  different
41       (a stereographic projection onto a Riemann Sphere).
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SEE ALSO

44       cabs(3), complex(7)
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COLOPHON

47       This  page  is  part of release 5.02 of the Linux man-pages project.  A
48       description of the project, information about reporting bugs,  and  the
49       latest     version     of     this    page,    can    be    found    at
50       https://www.kernel.org/doc/man-pages/.
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54                                  2015-04-19                          CPROJ(3)
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