Arrays in UDFs for VBA Excel

Posted on 2015-02-16
Last Modified: 2016-02-10
Hello Experts-

I have a UDF that pulls variables to calculate a customer's annual utility bill. The UDF references 12 months of usage data, each month is an individual cell reference which means 12 different variables in the UDF (plus the other ones needed). I've tried to name them as a range and simplify the UDF but have had no success. So, the question is, how can I pull in the 12 months of data as an array, have it cycle through the calculations and then spit out one annual number? Do I have name the range in Excel and reference that in the UDF cell equation?I have a copy of the spreadsheet attached.

Also, for some reason, I am unable to show more than one subroutine at a time in each module (I have to use the drop down box where is says declarations.) Is there a way to change this back?

Question by:TCristiano
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LVL 13

Accepted Solution

Jeff Darling earned 250 total points
ID: 40613064
One way to do that would be to build a delimited string with your parameters and then use the split function to create an array.

Here is a test function that passes the delimited string.

Public Function DoMyCalc(myData As String, strName)

Dim myRetVal
Dim ArrMyData

ArrMyData = Split(myData, "|")

myRetVal = 0

For i = 0 To UBound(ArrMyData)
  myRetVal = myRetVal + ArrMyData(i)

DoMyCalc = strName & " " & myRetVal

End Function

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Sample excel file attached
LVL 40
ID: 40613065
I can't help you with UDF, I have never used them, doing everything in VBA.

But for the modules, there are 2 toggle buttons in the lower left corner of the editor that lets you switch between the 2 different views.
LVL 13

Expert Comment

by:Jeff Darling
ID: 40613066
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LVL 13

Expert Comment

by:Jeff Darling
ID: 40613077
buttons that Jacques referred to.
LVL 45

Assisted Solution

aikimark earned 250 total points
ID: 40613089
If you reference a range object, you can assign a Variant data type variable = rangeobject.value

This will populate the Variant variable with a 2D array.
LVL 13

Expert Comment

by:Jeff Darling
ID: 40613119
Note that the 2D Array isn't zero based, it starts with 1.

Here is a sample based on aikimark's suggestion

Public Function foo(MyRange As Range, strName)

Dim myRetVal
Dim ArrMyRange

ArrMyRange = MyRange.Value
myRetVal = 0

For i = 1 To UBound(ArrMyRange,2) 
  myRetVal = myRetVal + ArrMyRange(1, i)

foo = strName & " " & myRetVal

End Function

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LVL 47

Expert Comment

by:Martin Liss
ID: 40667527
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.

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