Manual Reference Pages - CARG (3)
NAME
carg, cargf, cargl - calculate the complex argument
CONTENTS
Synopsis
Description
Versions
Colophon
SYNOPSIS
#include <complex.h>
double carg(double complex z );
float cargf(float complex z );
long double cargl(long double complex z );

Link with -lm .

DESCRIPTION
A complex number can be described by two real coordinates.
One may use rectangular coordinates and gets

z = x + I * y
where x = creal(z) and y = cimag(z) .

Or one may use polar coordinates and gets

z = r * cexp(I * a)

where r = cabs(z)
is the "radius", the "modulus", the absolute value of z , and
a = carg(z)
is the "phase angle", the argument of z .
One has:

tan(carg(z)) = cimag(z) / creal(z)

RETURN VALUE
The return value is the range of [-pi,pi].
VERSIONS
These functions first appeared in glibc in version 2.1.
CONFORMING TO
C99.
SEE ALSO
cabs (3),
complex (7)
COLOPHON
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