The LOG function returns a numeric value that approximates the logarithm to the base e (natural log) of argument-1. The type
of this function is numeric.

- Argument-1 must be class numeric.
- The value of argument-1 must be greater than zero.

- The returned value is the approximation of the logarithm to the base e of argument-1.
- Floating-point format is used for numeric non-integer results.