Name
carg, cargf, cargl - calculate the complex argumentLibrary
Math library ( libm ", " -lm )Synopsis
#include <complex.h> double carg(double complex " z ");
float cargf(float complex " z ");
long double cargl(long double complex " z ");
Description
These functions calculate the complex argument (also called phase angle) ofz, 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)
Return Value
The return value is in the range of [-pi,pi].Attributes
For an explanation of the terms used in this section, see attributes(7). allbox; lbx lb lb T{ carg()cargf()cargl()| Interface | Attribute | Value |
| T} | Thread safety | MT-Safe |