Ln
Purpose 
Returns the base-e (natural) logarithm of number.
Format 
Ln(number)
Parameters 
number - any numeric expression or field containing a numeric expression
Data type returned 
number
Description 
Number can be any positive value. Negative values return an error. For 0, the Ln function returns nothing because this value is out of the acceptable range. The Exp function is the inverse of the Ln function.
Examples 
Ln(2.7182818) returns .99999998....
Ln(Exp(5)) returns 5.
Related topics 
Functions reference (category list)
Functions reference (alphabetical list)
About formulas
About functions
Defining calculation fields
Using operators in formulas
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