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20060618, 22:08 #1
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Sum alternate cells (Excel 2000 SP3)
Is there a convenient way to tell Excel to sum alternate cells in either rows or columns? I have 80 columns with text then a number in adjacent cells repeated 40 times in each row. I can type =SUM(B2+D2+F2+H2+J2+ . . . . . . . . +BB2 etc ) but I thought there should be a more elegant way of writing the formula.
Thank you in anticipation of assistance in this question.

20060618, 22:19 #2
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Re: Sum alternate cells (Excel 2000 SP3)
Since SUM ignores text (treats it as a zero), try: =SUM(B2:CB2)

20060618, 22:21 #3
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Re: Sum alternate cells (Excel 2000 SP3)
=SUMPRODUCT((MOD(COLUMN(B2:BB2)COLUMN(B2)+0,2)=0),B2:BB2)
Microsoft MVP  Excel

20060618, 22:25 #4
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Re: Sum alternate cells (Excel 2000 SP3)
If the values in A2, C2, etc. are really text, use kweaver's formula. If there may be numbers among them:
<code>
=SUMPRODUCT(A2:BB2,1MOD(COLUMN(A2:BB2),2))</code>

20060618, 22:27 #5
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Re: Sum alternate cells (Excel 2000 SP3)
Hi malcolm
Have you tried these forulas
To sum every other row:
=SUMPRODUCT(MOD(ROW(A1:A100),2)*A1:A100) (odd rows)
=SUMPRODUCT((1MOD(ROW(A1:A100),2))*A1:A100) (even rows)
To sum every other column:
=SUMPRODUCT(MOD(COLUMN(A1:Z1),2)*A1:Z1) (odd columns)
=SUMPRODUCT((1MOD(COLUMN(A1:Z1),2))*A1:Z1) (even columns)
Obviously change the range to suit your needsJerry

20060618, 23:31 #6
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Re: Sum alternate cells (Excel 2000 SP3)
Hans  I appreciate very highly your response as well as the others I hope they see this response from me.
Malcolm

20060730, 19:27 #7
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Re: Sum alternate cells (Excel 2000 SP3)
>If the values in A2, C2, etc. are really text, use kweaver's formula. If there may be numbers among them:
=SUMPRODUCT(A2:BB2,1MOD(COLUMN(A2:BB2),2))
As there are numbers in the `text' cells I have used the above formula in the form:
=SUMPRODUCT(H4:BA4,1MOD(COLUMN(H4:BA4),2))
When I enter a number in I4 and press Enter the formula that is in E4 it does not respond; it continues to diplay 0 (zero). Can you see an error in the way I have used your formula?

20060730, 19:35 #8
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Re: Sum alternate cells (Excel 2000 SP3)
Hi Malcolm
I think you will need to convert the text to an integer. A nice and quick trick is to:
1) Type 1 into a blank cell
2) Highlight the cell
3) Edit>Copy
4) Highlight calls H4 to BA4
5) Goto the edit menu select Paste Special
6) Select Multiply
7) Press OK
This will convert any numbers stored as text in the range to a number. I believe this should solve your problem.Jerry

20060730, 20:07 #9
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Re: Sum alternate cells (Excel 2000 SP3)
Jerry,
This is my original question:
Is there a convenient way to tell Excel to sum alternate cells in either rows or columns? I have 80 columns with text then a number in adjacent cells repeated 40 times in each row. I can type =SUM(B2+D2+F2+H2+J2+ . . . . . . . . +BB2 etc ) but I thought there should be a more elegant way of writing the formula.
In cell H4, J4, L4 etc etc through to AZ4 there can be text & as it has turned out since numbers also. I want the formula to ignore H4, J4, L4 etc etc through to AZ4. I want the formula to sum the numbers in I4, K4, M4 etc etc to BA4. that is every second cell in row 4.
Can you help me with that aim please?

20060730, 20:12 #10
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Re: Sum alternate cells (Excel 2000 SP3)
You originally stated that you wanted to add the evennumbered columns B, D, F, etc.
Column I is an oddnumbered column (it is the 9th column), so a number in I4 will not be included in the result of the formula  according to your specification!
If you want to add the oddnumbered columns, change the formula to
<code>
=SUMPRODUCT(H4:BA4,MOD(COLUMN(H4:BA4),2))</code>

20060730, 21:08 #11
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Re: Sum alternate cells (Excel 2000 SP3)
Thank you for putting me right. It is very much appreciated.