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CLOG(3)                    Linux Programmer's Manual                   CLOG(3)

       clog, clogf, clogl - natural logarithm of a complex number

       #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.

       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.

       These functions first appeared in glibc in version 2.1.


       cabs(3), cexp(3), clog10(3), clog2(3), complex(7)

       This  page  is  part of release 3.74 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

                                  2008-08-11                           CLOG(3)

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