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carg (3)
CARG(3) Linux Programmer's Manual CARG(3)
NAME
carg, cargf, cargl - calculate the 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].
CONFORMING TO
C99
SEE ALSO
cabs(3), complex(7)
2002-07-28 CARG(3)
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