Question

I want to write a Excel function like this. It is an extension of the Dec2Bin function

Public Function Dec2BinEx(x As Long)
  Dec2BinEx = dec2bin(x) + 10
End Function

But I am getting an error when trying to use it. How do I call a excel function inside the visual basic editor

Answer 1

In general, you call Excel functions with Application.WorksheetFunction.SomeFunctionName. However, Dec2Bin is special, as it is an Add-In function, and not a pure Excel function. Hence, Application.WorksheetFunction does not work here. Instead, you have to make the functions of the add-in available to your code. To do so, follow these steps

• In Excel, menu Tools/Add-Ins, make
  sure that the add-in Analysis
ToolPak - VBA is imported.

• Then, set a reference to this add-in
  in your code: in the VBA editor, menu
  Tools/References, add a reference to
  atpvbaen.xls.

Then, your original code, as posted in your quesiton should work just fine.