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
Originated in 
FileMaker Pro 6.0 or earlier
Description 
Number can be any positive value. Negative values and 0 return an error. 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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