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



NAME
       log, logf, logl - natural logarithmic function

SYNOPSIS
       #include <&lt;math.h>&gt;

       double log(double x);
       float logf(float x);
       long double logl(long double x);

       Link with -lm.

DESCRIPTION
       The log() function returns the natural logarithm of x.

ERRORS
       EDOM   The argument x is negative.

       ERANGE The  argument  x is zero.  The log of zero is not defined (minus
              infinity).

CONFORMING TO
       SVr4, 4.3BSD, C89.  The float and long double variants are C99 require-
       ments.

SEE ALSO
       cbrt(3), clog(3), log1p(3), sqrt(3)

COLOPHON
       This  page  is  part of release 3.05 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/.



                                  2008-07-15                            LOG(3)