NAME
carg, cargf, cargl - calculate the argument
SYNOPSIS
#include <complex.h>
I double carg(double complex z );
I float cargf(float complex z );
I 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].
CONFORMING TO
C99
SEE ALSO
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