CARG(3) Linux Programmer s Manual CARG(3)
NAME carg, cargf, cargl - calculate the 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.
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 3.22 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/.