cproj(3) — Linux manual page


cproj(3)                Library Functions Manual                cproj(3)

NAME         top

       cproj, cprojf, cprojl - project into Riemann Sphere

LIBRARY         top

       Math library (libm, -lm)

SYNOPSIS         top

       #include <complex.h>

       double complex cproj(double complex z);
       float complex cprojf(float complex z);
       long double complex cprojl(long double complex z);

DESCRIPTION         top

       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 z projects to z itself.  Every complex
       infinite value is projected to a single infinite value, namely to
       positive infinity on the real axis.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       │ Interface                           Attribute     Value   │
       │ cproj(), cprojf(), cprojl()         │ Thread safety │ MT-Safe │

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       glibc 2.1.  C99, POSIX.1-2001.

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

SEE ALSO         top

       cabs(3), complex(7)

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                       cproj(3)

Pages that refer to this page: complex(7)