Ln                       Returns Natural Logarithm of x

 Ln(X : Real) : Real;
 Ln(X : Integer) : Real;

    Returns the natural logarithm of X--i.e., the log (base e) of X.

               X    An integer or real value (constant, variable, function
                    call, or expression).

         Limits:    if X <= 0, runtime error 4 ($4) occurs.

          Notes:    The value e is approximately 2.71828182846 and has
                    special significance in mathematics. Note that
                    Exp(Ln(X)) = X.

  -------------------------------- Example ---------------------------------

           X := Ln(42);             { X = 3.7376696183 }