redhat man page for log

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

NAME
       exp, log, log10, pow - exponential, logarithmic and power functions

SYNOPSIS
       #include <math.h>

       double exp(double x);

       double log(double x);

       double log10(double x);

       double pow(double x, double y);

DESCRIPTION
       The exp() function returns the value of e (the base of natural logarithms) raised to the power of x.

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

       The log10() function returns the base-10 logarithm of x.

       The pow() function  returns the value of x raised to the power of y.

ERRORS
       The log() and log10() functions can return the following errors:

       EDOM   The argument x is negative.

       ERANGE The argument x is zero.  The log of zero is not defined.

       The pow() function can return the following error:

       EDOM   The argument x is negative and y is not an integral value.  This would result in a complex number.

CONFORMING TO
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       sqrt(3), cbrt(3)

GNU
								    1993-06-16								    EXP(3)