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);
Note
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), 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/.
Copyright 2002 Walter Harms (walter.harmsinformatik.uni-oldenburg.de)
Distributed under GPL