custom function error.

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I'm trying to create a custom function to use in my spread sheet, but it return a #NAME error, what am i doing wrong?
[vba]Option Explicit

Function PV_list(WOs As Range) As String
Dim r As Range
Dim list As String
For Each r In WOs
list = list & "^" & r.Value
Next r
PV_list = list
End Function
[/vba]
Here is what it does:
Lets say A1 = a, A2 = b and A3 = c, by typing =PV_list(A1:A3) is should get the following output: a^b^c
This is saved in PERSONAL.xls.

Thanks.

[mdmackillop]

=PERSONAL.XLS!PV_list(A1:A4)

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Thanks, it's working, but is there any way to make it so that i won't have to type "=personal.xls!" all the time?

[mdmackillop]

You could save the function in an Add-In (XLA file) See here

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Thanks i'll check that out!