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 LOG()
 Calculate the natural logarithm of a numeric value
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 Syntax

     LOG(<nExp>) --> nNaturalLog

 Arguments

     <nExp> is a numeric value greater than zero to convert to its
     natural logarithm.

 Returns

     LOG() returns the natural logarithm as a numeric value.  If <nExp> is
     less than or equal to zero, LOG() returns a numeric overflow (displayed
     as a row of asterisks).

 Description

     LOG() is a numeric function that calculates the natural logarithm of a
     number and is the inverse of EXP().  The natural logarithm has a base of
     e which is approximately 2.7183.  The LOG() function returns x in the
     following equation:

     e**x = y

     where y is the numeric expression used as the LOG() argument (i.e.,
     LOG(y) = x).  Due to mathematical rounding, the values returned by LOG()
     and EXP() may not agree exactly (i.e., EXP(LOG(x)) may not always equal
     x).

 Examples

     .  These examples demonstrate various results of LOG():

        ? LOG(10)                // Result: 2.30
        ? LOG(10 * 2)            // Result: 3.00
        ? EXP(LOG(1))            // Result: 1.00
        ? LOG(2.71)              // Result: 1.00

     .  This example is a user-defined function that returns the base
        10 logarithm:

        FUNCTION Log10( nNumber )
        IF nNumber > 0
           RETURN LOG(nNumber)/LOG(10)
        ELSE
           RETURN NIL
        ENDIF

 Files:  Library is CLIPPER.LIB.