|CLOG(3)||Linux Programmer's Manual||CLOG(3)|
NAME¶clog, clogf, clogl - natural logarithm of a complex number
double complex clog(double complex z);
float complex clogf(float complex z);
long double complex clogl(long double complex z);
Link with -lm.
DESCRIPTION¶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), then z = cexp(y). The imaginary part of y is chosen in the interval [-pi,pi].
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.
ATTRIBUTES¶For an explanation of the terms used in this section, see attributes(7).
|clog (), clogf (), clogl ()||Thread safety||MT-Safe|
CONFORMING TO¶C99, POSIX.1-2001, POSIX.1-2008.
SEE ALSO¶cabs(3), cexp(3), clog10(3), clog2(3), complex(7)
COLOPHON¶This page is part of release 4.10 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.