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Linux 2.6 - man page for clog (linux section 3)

CLOG(3) 			    Linux Programmer's Manual				  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), clog2(3), complex(7)

COLOPHON
       This  page  is  part of release 3.55 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/.

					    2008-08-11					  CLOG(3)


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