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 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.
C99.
SEE ALSO¶
cabs(3),
complex(7)
COLOPHON¶
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man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
