table of contents
other versions
- stretch 4.10-2
- testing 4.16-2
- stretch-backports 4.16-1~bpo9+1
- unstable 4.16-2
other sections
CLOG(3) | Linux Programmer's Manual | CLOG(3) |
NAME¶
clog, clogf, clogl - natural logarithm of a complex numberSYNOPSIS¶
#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¶
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].
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.ATTRIBUTES¶
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
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/.2015-04-19 |