clog, clogf, clogl - natural logarithm of a complex number
double complex clog(double complex
float complex clogf(float complex
long double complex clogl(long double complex
These functions calculate the complex natural logarithm of
z, with a branch cut along the negative real axis.
The logarithm clog() is the inverse function of the
exponential cexp(3). Thus, if
y = clog(z),
z = cexp(y). The imaginary part of
y is chosen in
the interval [-pi,pi].
clog(z) = log(cabs(z)) + I * carg(z)
z close to zero will cause an overflow.
These functions first appeared in glibc in version 2.1.
For an explanation of the terms used in this section, see attributes(7).
|clog(), clogf(), clogl()||Thread safety||MT-Safe|
C99, POSIX.1-2001, POSIX.1-2008.
This page is part of release 5.10 of the Linux
project. A description of the project, information about reporting bugs,
and the latest version of this page, can be found at