NAME
cproj, cprojf, cprojl - project into Riemann Sphere SYNOPSIS
#include
double complex cproj(double complex z); float complex cprojf(float complex z); long double complex cprojl(long double complex z); Link with -lm. DESCRIPTION This function projects a point in the plane onto the surface of a Rie‐
mann 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. VERSIONS These functions first appeared in glibc in version 2.1. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────────────┼───────────────┼─────────┤
│cproj(), cprojf(), cprojl() │ Thread safety │ MT-Safe │ └────────────────────────────┴───────────────┴─────────┘ CONFORMING TO C99. NOTES In glibc 2.11 and earlier, the implementation does something different (a stereographic projection onto a Riemann Sphere). SEE ALSO cabs(3), complex(7) COLOPHON
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2010-06-10 CPROJ(3)