basic information on writing functions

ANDREW_SAUNDERS

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where is the best place to get on line infromation about writing functions ?
i have tried with a simple example which works but keep geting "null errors " when opening database form
 
Writing functions is really not that different from writing sub-procedures except that the funciton is designed to return a value to a calling function or sub-procedure.
As far as the null errors that you are getting, I can say that any mathmatic operation that you try that references a null value will cause an error. You can experiment with various ways to test for null or to substitute for null in you equations. Try looking up NZ or IsNull in the Help...
HTH
Chris
 

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