 clog(3)  phpMan
CLOG(3) Linux Programmer's Manual CLOG(3)
NAME
clog, clogf, clogl  natural logarithm of a complex number
SYNOPSIS
#include <complex.h>
double complex clog(double complex z);
float complex clogf(float complex z);
long double complex clogl(long double complex z);
Link with lm.
DESCRIPTION
The logarithm clog() is the inverse function of the exponential cexp(3). Thus, if
y = clog(z), then z = cexp(y). The imaginary part of y is chosen in the interval
[pi,pi].
One has:
clog(z) = log(cabs(z)) + I * carg(z)
Note that z close to zero will cause an overflow.
VERSIONS
These functions first appeared in glibc in version 2.1.
CONFORMING TO
C99.
SEE ALSO
cabs(3), cexp(3), clog10(3), clog2(3), complex(7)
COLOPHON
This page is part of release 3.74 of the Linux manpages project. A description of the
project, information about reporting bugs, and the latest version of this page, can be
found at http://www.kernel.org/doc/manpages/.
20080811 CLOG(3)
