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       This  function projects 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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CONFORMING TO

28       C99.
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NOTES

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

35       cabs(3), complex(7)
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COLOPHON

38       This page is part of release 3.25 of the Linux  man-pages  project.   A
39       description  of  the project, and information about reporting bugs, can
40       be found at http://www.kernel.org/doc/man-pages/.
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44                                  2010-06-10                          CPROJ(3)