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
cc [ 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 5.10 1 Sep 2002 cproj(3M)
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