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

NAME
     ccpprroojj - projection onto the Riemann sphere

SYNOPSIS
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     double complex
     ccpprroojj(double complex z);

     long double complex
     ccpprroojjll(long double complex z);

     float complex
     ccpprroojjff(float complex z);

DESCRIPTION
     ccpprroojj(z) computes the projection of a complex floating-point number z
     onto the Riemann sphere: for any finite z, ccpprroojj(z) = z, but all complex
     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 infin-
     ity), then ccpprroojj(z) is equivalent to INFINITY + I*copysign(0.0,cimag(z)).

NNOOTTEE
     ccpprroojj() 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 ccpprroojj() function conforms to ISO/IEC 9899:1999(E).

4th Berkeley Distribution      October 10, 2006      4th Berkeley Distribution