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LOG returns the natural logarithm of a numeric expression.
 
LOG(numeric-expression)
    ■ The argument numeric-expression must be greater than zero.
 
Usage Notes
    ■ LOG is calculated in single precision if numeric-expression is an
      integer or single-precision value. If you use any other numeric data
      type, LOG is calculated in double-precision.
    ■ The natural logarithm is the logarithm to the base e. The constant
      e is approximately equal to 2.718282.
    ■ You can calculate base-10 logarithms by dividing the natural logarithm
      of the number by the natural logarithm of 10. The following FUNCTION
      procedure calculates base-10 logarithms:
 
         FUNCTION Log10(X) STATIC
            Log10=LOG(X)/LOG(10#)
         END FUNCTION