mojave man page for cproj

Query: cproj

OS: mojave

Section: 3

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CPROJ(3)						   BSD Library Functions Manual 						  CPROJ(3)

NAME
cproj -- projection onto the Riemann sphere
SYNOPSIS
#include <complex.h> double complex cproj(double complex z); long double complex cprojl(long double complex z); float complex cprojf(float complex z);
DESCRIPTION
cproj(z) computes the projection of a complex floating-point number z onto the Riemann sphere: for any finite z, cproj(z) = z, but all com- plex infinities (including infinities with one NaN part) project to positive infinity on the real axis. Specifically, if z = x + iy has an infinite part (one of x or y is infinity), then cproj(z) is equivalent to INFINITY + I*copy- sign(0.0,cimag(z)).
NOTE
cproj() projects onto the C99 "Riemann Sphere", which may not agree with the mathematical notion of the Riemann Sphere; in particular, it has two infinites (inf +- 0i) and four zeroes (+-0 +- 0i).
SEE ALSO
complex(3)
STANDARDS
The cproj() function conforms to ISO/IEC 9899:2011. 4th Berkeley Distribution December 11, 2006 4th Berkeley Distribution
Related Man Pages
cprojf(3m) - opensolaris
cprojf(3m) - sunos
cprojl(3m) - sunos
cproj(3) - redhat
cproj(3) - x11r4
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