Returns the base-e (natural) logarithm of a number.
Ln ( number )number - any numeric expression or field containing a numeric expression
number
FileMaker Pro 6.0 or earlier
Number can be any positive value. Negative values and 0 return an error. The Exp function is the inverse of the Ln function.
Ln(2.7182818) returns .99999998....
Ln(Exp(5)) returns 5.