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Note that putting all the references in the argument list does not control the initial sequence which Excel uses to calculate the UDF, and it may well be calculated more than once per recalculation cycle.See UDFs evaluated more than once per workbook calculation.
To ensure that the code in a Function is executed in dependency sequence you need to use ISEMPTY to check the input argument(s). Function my Sum2(Sheet Name as string) as Variant Application. Value+the Second Cell.value End Function Whenever you modify the code in a UDF Excel flags all instances of the UDF in all open workbooks as being uncalculated.If you then do a sheet.calculate or shift/F9 Excel will not only calculate the currently selected worksheet(s), but will also evaluate all the instances of the UDF that are not on the currently selected worksheets.You should make sure that you have an On Error handler in your UDF to handle both real errors and errors that are caused by out of sequence execution.Un-trapped errors can halt the calculation process before it is complete.Excel depends on analysis of the input arguments of a Function to determine when a Function needs to be evaluated by a recalculation.What this means is that the function will only be flagged as needing evaluation when one or more of the input arguments change (unless the function is volatile).
If your UDF gets input values from any cells that are not in its argument list then it may not be recalculated, and give the wrong answer.
Mostly you can bypass this problem by doing a Full Calculation (Ctrl-Alt-F9), rather than a recalculation (F9), or by making your UDF volatile, but I strongly recommend that you put all the input cells in the argument list.
During a recalculation if Excel does evaluate the UDF it determines which cell references are actually being used inside the function to affect the function result, and if those cells have not yet been finally calculated it will reschedule the Function for later calculation.
This is required to make the UDF be finally calculated in the correct dependency sequence.
Function my Sum1(Sheet Name as string) as Variant my Sum1=Worksheets(Sheetname). Range("A2") End Function This function will not automatically recalculate if Data!
A2 changes: it will only automatically recalculate when Sheetname changes.