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Linux Programmer's Manual (3)
carg, cargf, cargl - calculate the complex argument
double carg(double complex z);
float cargf(float complex z);
long double cargl(long double complex z);
Link with -lm.
A complex number can be described by two real coordinates.
One may use rectangular coordinates and gets
z = x + I * y
x = creal(z)
y = cimag(z).
Or one may use polar coordinates and gets
z = r * cexp(I * a)
r = cabs(z)
is the "radius", the "modulus", the absolute value of
a = carg(z)
is the "phase angle", the argument of
tan(carg(z)) = cimag(z) / creal(z)
The return value is the range of [-pi,pi].
These functions first appeared in glibc in version 2.1.
This page is part of release 3.66 of the Linux
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Time: 21:42:59 GMT, July 12, 2014