# Why does my array formula not work here

I have taken over an Excel training from a coleague, where I have to show array calculations.

This is all fine, and the exercise Works fine apart from the last part.

I have a report with customer sales (Omsætning) and calculate the customer rebate (kunderabat) as an array formula. this Works fine.

Now I have to calculate the total sum of customer rebate for 4 specific customers. They are listed in Range K8:K11, and I want the calculation done as a new arrayformula in Range L8:L11.

I tried marking all 4 rows and inserting the formula =sum(if(Kunde=K8,Kunderabat,0) finishing with CTRL + SHIFT + ENTER. that gives me the result for the first customer in all 4 cells.

I tried to  change the formula to =sum(if(Kunde=K8:K11,Kunderabat,0) but then I got no result at all

It all Works fine if I do this cell by cell and changing K8 to K9 in the Next cell etc.

What do I do wrong - and can it be solved in other ways?

best regards

Jørgen
Kunderabat.xlsx
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Commented:
You don't have to change the formula manually, you can copy the formula down and K8 will change automatically on each row.

Try this:

Delete all current formulas in L8:L11

Insert this formula in L8

=SUMIF(Kunde,K8,Kunderabat)

That doesn't need "array entry"

Now copy down by selecting that cell, place cursor on bottom right of cell until you see a black "+" - that's the fill-handle - hold down left mouse button and drag down to L11. As I say K8 will change as you drag down

regards, barry
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ConsultantAuthor Commented:
Hi Barry

that is indead a solution, that Works. The problem though is that the lesson is related to array calculations and the material is send to the participants.

So I guess I need to come up with an array solution :-(

regards
Jørgen
0
Commented:
OK, if you want a single array formula entered in a range try this

=SUMIF(Kunde,K8:K11,Kunderabat)

Place in L8, then select the whole range L8:L11 and use CTRL+SHIFT+ENTER to confirm

regards, barry
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ConsultantAuthor Commented:
I know that we should look for the easy solution, but in this case you gave me something that was needed more than the best. Thanks.

And if I will do the training Again - I will rewrite this part.

Jørgen
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