carg(3) -- Linux man page
NAME
carg, cargf, cargl - calculate the argument
SYNOPSIS
#include <complex.h>
double carg(double complex z);
float cargf(float complex z);
long double cargl(long double complex z);
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 carg(z) = atan(creal(z) / cimag(z)).
RETURN VALUE
The return value is the range of [-pi,pi].
CONFORMING TO
C99
SEE ALSO
cabs(3),
complex(5)
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