1CPROJ(3)                     complex math routines                    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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CONFORMING TO

25       C99
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NOTE

28       The  glibc implementation is broken and does something entirely differ‐
29       ent.
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SEE ALSO

32       cabs(3), complex(7)
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36                                  2002-07-28                          CPROJ(3)
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