Linux 2.6 - man page for carg (linux section 3)
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CARG(3) Linux Programmer's Manual CARG(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 coor-
dinates 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.
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.
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