| CARG(3) | Linux Programmer's Manual | CARG(3) |
carg, cargf, cargl - calculate the complex argument
#include <complex.h>
double carg(double complex z);
float cargf(float complex z);
long double cargl(long double complex z);
Link with -lm.
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].
These functions first appeared in glibc in version 2.1.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| carg (), cargf (), cargl () | Thread safety | MT-Safe |
C99, POSIX.1-2001, POSIX.1-2008.
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| 2017-09-15 |