# cproj(3) [osx man page]

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

## Check Out this Related Man Page

cproj(3M)						  Mathematical Library Functions						 cproj(3M)

NAME
cproj, cprojf, cprojl - complex projection functions SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <complex.h> double complex cproj(double complex z); float complex cprojf(float complex z); long double complex cprojl(long double complex z); DESCRIPTION
These functions compute a projection of z onto the Riemann sphere: z projects to z, except that all complex infinities (even those with one infinite part and one NaN part) project to positive infinity on the real axis. If z has an infinite part, then cproj(z) is equivalent to: INFINITY + I * copysign(0.0, cimag(z)) RETURN VALUES
These functions return the value of the projection onto the Riemann sphere. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
carg(3M), cimag(3M), complex.h(3HEAD), conj(3M), creal(3M), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 cproj(3M)
Man Page

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