If both fields are numeric and the result of subtraction of field1-field2 is positive, only then put the result is a data field.
I am doing this within an Iris DTL.
I don't find any functions like IsNumeric(). Once I get that, I can test if field1>0 and field2>0, do the subtraction, and test if diff>0.
I just need a function to determine if they are numeric, rather than some cumbersome way like a regex where the only characters are 0-9.
I see functions in documentation but don't see them used at tests, only in WRITE statements.
Thanks,