Интерактивная система просмотра системных руководств (man-ов) cargf (3) cargf ( Русские man: Библиотечные вызовы ) >> cargf ( Linux man: Библиотечные вызовы ) cargf ( POSIX man: Библиотечные вызовы )
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 .
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 complex
COLOPHON
This page is part of release 3.14 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/.
Index
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
VERSIONS
CONFORMING TO
SEE ALSO
COLOPHON
