Linux manual pages Section 3: Subroutines  

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);
 
[Note] Note

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 3.52 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/.


  Copyright 2002 Walter Harms (walter.harmsinformatik.uni-oldenburg.de)

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