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), complex(7)
COLOPHON
- This page is part of release 3.25 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/.