Calling a Add-in function from Excel's VBA

Posted by graham on Stack Overflow See other posts from Stack Overflow or by graham
Published on 2010-06-17T16:08:28Z Indexed on 2010/06/17 16:13 UTC
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I am using an Excel Add-in for an Erlangs: http://abstractmicro.com/erlang/helppages/ref-erlbblockage.htm

I try to call the Erlang-B function within the Add-in from within VBA thus:

Function Erl(Erlangs As Double, Capacity As Double)

Erl = Application.WorksheetFunction.ErlbBlockage(Capacity, Erlangs)

End Function

...but it doesn't work. I get #VALUE! returned in the Excel cell. I think it is because the function is not part of standard Excel (it is in the Add-in). So how do I call it?

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