CARG, CARGF, CARGL - reference manual online

Calculate the complex argument.

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 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.
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────┼───────────────┼─────────┤ │carg(), cargf(), cargl() │ 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 4.04 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
2015-04-19 CARG(3)
This manual Reference Other manuals
carg(3) referred by atan(3) | atan2(3) | complex(7)
refer to attributes(7) | cabs(3) | complex(7)