carg, cargf, cargl — calculate the argument
#include <complex.h>
double carg( |
double complex | z) ; |
float
cargf( |
float complex | z) ; |
long
double cargl( |
long double complex | z) ; |
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Note |
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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).