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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 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.
CONFORMING TO
       C99.
SEE ALSO
       cabs(3), complex(7)
COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

                                  2008-08-11                           CARG(3)