Ln
Calculation of the natural logarithm of a strictly positive number.
Syntax
Ln(number)
number = number (strictly positive) whose natural logarithm you want to calculate
Remarks
Returns NaN (Not a Number) for a strictly negative number, and -INF for zero.
The inverse function is Exp. To calculate the base-10 logarithm, see Log.
Example
Ln(1) = 0