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)
Check Out this Related Man Page
CIMAG(3) BSD Library Functions Manual CIMAG(3)NAME
cimag, cimagf, cimagl, conj, conjf, conjl, cproj, cprojf, cprojl, creal, crealf, creall -- functions to manipulate complex numbers
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <complex.h>
double
cimag(double complex z);
float
cimagf(float complex z);
long double
cimagl(long double complex z);
double complex
conj(double complex z);
float complex
conjf(float complex z);
long double complex
conjl(long double complex z);
double complex
cproj(double complex z);
float complex
cprojf(float complex z);
long double complex
cprojl(long double complex z);
double
creal(double complex z);
float
crealf(float complex z);
long double
creall(long double complex z);
DESCRIPTION
Let a+b*i denote the complex number z.
The creal() functions return the real part a, and the cimag() functions return the imaginary part b.
The conj() functions return the complex conjugate a-b*i.
The cproj() functions return the projection onto the Riemann sphere. If z contains an infinite component, then the result is infinity +-
0*i, where the (zero) imaginary part of the result has the same sign as b. Otherwise, the result is z.
These functions do not signal any floating point exceptions.
STANDARDS
The cimag(), conj(), cproj(), and creal() functions conform to ISO/IEC 9899:1999 (``ISO C99'').
HISTORY
The cimag(), conj() and creal() functions first appeared in FreeBSD 5.3. The cproj() functions appeared in FreeBSD 8.0.
BSD August 7, 2008 BSD
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