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Linux and UNIX Man Pages

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Linux 2.6 - man page for cargl (linux section 3)

CARG(3) 						     Linux Programmer's Manual							   CARG(3)

NAME
carg, cargf, cargl - calculate the complex 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
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)
RETURN VALUE
The return value is the range of [-pi,pi].
VERSIONS
These functions first appeared in glibc in version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-------------------------+---------------+---------+ |Interface | Attribute | Value | +-------------------------+---------------+---------+ |carg(), cargf(), cargl() | Thread safety | MT-Safe | +-------------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
SEE ALSO
cabs(3), complex(7) 2017-09-15 CARG(3)

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