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# Thread: Can an array formula reliably do this kind of totaling?

1. ## Can an array formula reliably do this kind of totaling?

I want to sum (by month) sales by person and multiply by the price to get total sales by month.

I thought something like {=SUM(SUM(B5:E12)*G5:G12)} or just plain {=SUM(B5:E12)*G5:G12} would work, but it doesn't, as you can see in the cell identified as "Wrong". The cell marked "Right" is a simple sum of the extended products above it--I added the sales in weeks 1 thru 4 then multiplied the total by the price for each row. Is there an array formula or some other approach that won't involve extra/hidden rows to accomplish the task? It needs to span blank rows and text without blowing up. In a test, I essentially created the Red Team block and was able to get the correct answer. However, it may have been dumb luck--once I edited or added to it so that it was more realistic like what I've shown here it quit working. I'm trying to avoid a normal formula like =sum(B5:E5)*G5+sum(B6:E6)* G6+.... as there are quite a few rows an this becomes immediately tedious. Of course, if you have some other slick way of doing this, I'd be happy to see that too!

Excel 2010
ABCDEFGHI
1Sales
2Jan   Price
3wk1wk2wk3wk4JanExt Jan
4Red Team
5Joe1111520
6Mary2929244
7Fred5544590
8
9Blue Team0
10Jane1233654
11Marge5633351
12Kevin89335115
13
142418<< WrongRight>>374

Sheet1

2. ## Re: Can an array formula reliably do this kind of totaling?

=SUM(B5:E12*G5:G12)
(CSE, of course)

3. ## Re: Can an array formula reliably do this kind of totaling?

Originally Posted by BobUmlas
=SUM(B5:E12*G5:G12)
(CSE, of course)
Instead of SUM committed with CSE, why not just use SUMPRODUCT?

=SUMPRODUCT(B5:E11*G5:G11)

4. ## Re: Can an array formula reliably do this kind of totaling?

Try the SumProduct with its native syntax:

=SUMPRODUCT(B5:E11,G5:G11)

as it's devised exactly for this, that is, for multiplying a set of numerical terms.

5. ## Re: Can an array formula reliably do this kind of totaling?

Try the SumProduct with its native syntax:

=SUMPRODUCT(B5:E11,G5:G11)

as it's devised exactly for this, that is, for multiplying a set of numerical terms.
Good point!

6. ## Re: Can an array formula reliably do this kind of totaling?

Excellent--didn't realize excel do the 'right' thing when multiplying inside sumproduct--I thought the ranges had to be the same size. BTW, =SUMPRODUCT(B5:E11*G5:G11) works, the 'native syntax' =SUMPRODUCT(B5:E11,G5:G11) does not--it generates an error. But it doesn't need to be CSE.

7. ## Re: Can an array formula reliably do this kind of totaling?

Originally Posted by dcoons
Excellent--didn't realize excel do the 'right' thing when multiplying inside sumproduct--I thought the ranges had to be the same size. BTW, =SUMPRODUCT(B5:E11*G5:G11) works, the 'native syntax' =SUMPRODUCT(B5:E11,G5:G11) does not--it generates an error. But it doesn't need to be CSE.
=SUMPRODUCT(B5:E11,G5:G11)

does work, provided that B5:E11 and G5:G11 consist of true numbers. If you are on a non-American system, try:

=SUMPRODUCT(B5:E11;G5:G11)

8. ## Re: Can an array formula reliably do this kind of totaling?

Aladin, that will give you a #VALUE! error as the ranges are not the same size.

Sheet1

 B C D E F G H I 5 20 30 40 50 1 #VALUE! 6 24 36 48 60 2 7 28 42 56 70 3 8 32 48 64 80 4 9 36 54 72 90 5 10 40 60 80 100 6 11 44 66 88 110 7

 Cell Formula I5 =SUMPRODUCT(B5:E11,G5:G11)

Excel tables to the web >>

9. ## Re: Can an array formula reliably do this kind of totaling?

Originally Posted by Scott Huish
Aladin, that will give you a #VALUE! error as the ranges are not the same size.
...
My bad. I kept reading B5:B11 while writing down B5:E11. My concern clearly does not apply. One of Sum or SumProduct with the * operator is the choice. If the ranges involved do house formula blanks or other text:

=SUM(IF(ISNUMBER(1/(B1:E11*G1:G11)),B1:E11*G1:G11))

confirmed with control+shift+enter, not just enter, would be the way out. The foregoing would behave like the native SumProduct with appropriate ranges.

10. ## Re: Can an array formula reliably do this kind of totaling?

OK, one more twist. If someone typed a bit of text in C8 of the original example, the =sumproduct(rng*rng) will fail due to the text value on that row. Any way to have sumproduct ignore text in this context? or treat it as a zero?

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