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cproj(3) Library Functions Manual cproj(3)
cproj, cprojf, cprojl - project into Riemann Sphere
Math library (libm, -lm)
#include <complex.h> double complex cproj(double complex z); float complex cprojf(float complex z); long double complex cprojl(long double complex z);
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.
For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────────────────┬───────────────┬─────────┐ │ Interface │ Attribute │ Value │ ├─────────────────────────────────────┼───────────────┼─────────┤ │ cproj(), cprojf(), cprojl() │ Thread safety │ MT-Safe │ └─────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
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).
cabs(3), complex(7)
Linux man-pages (unreleased) (date) cproj(3)
Pages that refer to this page: complex(7)