[Go to CFHT Home Page] Man Pages
Back to Software Index  BORDER=0Manpage Top Level
    CLOG(3) manual page Table of Contents

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) , clog2(3) , complex(7)

Colophon

This page is part of release 3.78 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 http://www.kernel.org/doc/man-pages/.

Table of Contents