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carg

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);

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

cabs(3), complex(7)