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

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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 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
       This  page  is  part of release 3.55 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)
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