Guardian Native C Library Calls Reference Manual (G06.29+, H06.08+, J06.03+)

cproj(3) Guardian Native C Library Calls Reference Manual
NAME
cproj - Computes the complex projection function
LIBRARY
H-series and J-series native Guardian processes: $SYSTEM.ZDLLnnn.ZCREDLL
32-bit H-series and J-series OSS processes: /G/system/zdllnnn/zcredll
64-bit H-series and J-series OSS processes: /G/system/zdllnnn/ycredll
SYNOPSIS
#include <complex.h>
double complex cproj(
double complex z);
PARAMETERS
z Is the value to be projected.
DESCRIPTION
The cproj() function computes a projection of z onto the Riemann sphere. The cproj() function
returns z for z, except if z is a complex infinity (even if it is a complex infinity with one infinite
part and one Nan part). If z is a complex infinity, cproj() returns positive infinity on the real
axis. If z has an infinite part then cproj() is equivalent to:
INFINITY+I* copysign(0,0, cimag(z))
NOTES
This function is implemented only for the IEEE_float floating-point option. Applications using
this function cannot be compiled if the specified floating-point option is Tandem_float.
RETURN VALUES
The cproj() function returns the value of the projection on the Riemann sphere.
ERRORS
No errors are defined.
RELATED INFORMATION
Functions: carg(3), cimag(3), conj(3), cprojf(3), cprojl(3), creal(3).
STANDARDS CONFORMANCE
This function conforms to the ISO/IEC 9899:1999 standard.
This function conforms to the IEEE Std 1003.1, 2004 Edition.
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