Man page - cargf(3)

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carg, cargf, cargl - calculate the complex argument

Math library ( libm , -lm )

#include <complex.h>

double carg(double complex z );
float cargf(float complex z );
long double cargl(long double complex z );

These functions calculate the complex argument (also called phase angle) of z , with a branch cut along the negative real axis.

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)

The return value is in the range of [-pi,pi].

For an explanation of the terms used in this section, see attributes (7).

Image grohtml-304285-1.png

C11, POSIX.1-2008.

glibc 2.1. C99, POSIX.1-2001.