 carg(3)  phpMan
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
A complex number can be described by two real coordinates. One may use rectangular coor‐
dinates 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.
CONFORMING TO
C99.
SEE ALSO
cabs(3), complex(7)
COLOPHON
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project, information about reporting bugs, and the latest version of this page, can be
found at http://www.kernel.org/doc/manpages/.
20080811 CARG(3)
