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man:cargl

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

     These  functions  calculate  the  complex  argument  (also called phase
     angle) of z, with a branch cut along the negative real axis.
     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.

ATTRIBUTES

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     allbox;  lbw24  lb  lb  l  l  l.   Interface Attribute Value T{ carg(),
     cargf(), cargl() T}   Thread safety  MT-Safe

CONFORMING TO

     C99, POSIX.1-2001, POSIX.1-2008.

SEE ALSO

     cabs(3), complex(7)

COLOPHON

     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                           CARG(3)
/data/webs/external/dokuwiki/data/pages/man/cargl.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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