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

NAME
     cproj -- projection onto the Riemann sphere

SYNOPSIS
     ##include <>

     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 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 cproj(z) is equivalent to INFINITY ] I*copysign(0.0,cimag(z)).

SEE ALSO
     complex(3)

STANDARDS
     The cproj() function conforms to ISO/IEC 9899:1999(E).

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