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SUM array works, COUNT array does not?

  1. #1
    Administrator FDibbins's Avatar
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    SUM array works, COUNT array does not?

    In an array like this...
    A
    B
    C
    2
    1
    2
    4
    3
    2
    4
    8
    4
    3
    6
    12
    5
    4
    8
    16
    6
    5
    10
    20


    I am trying to sum and count numbers in every 2nd row.

    I am using these ARRAY's...
    =SUM(IF(MOD(A1:A6,2)=1,A1:C6,0))
    works fine, gives 63

    and then...
    =COUNT(IF(MOD(A1:A6,2)=1,A1:C6,0))
    doesnt work, gives 18

    What gives, what am I missing?

    Edit: It seems that it is doubling the count...6 rows using every 2nd row = 3 rows with 3 values in each = 9 numbers, not 18
    Last edited by FDibbins; 10-10-2014 at 08:41 PM.
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  2. #2
    Forum Guru Pete_UK's Avatar
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    Re: SUM array works, COUNT array does not?

    You are telling it to count a zero on even rows - try it this way:

    =COUNT(IF(MOD(ROW(A1:C6),2)=1,A1:C6))

    (CSE-entered). Note: count nothing if even.

    Hope this helps.

    Pete

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    Forum Expert Vikas_Gautam's Avatar
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    Re: SUM array works, COUNT array does not?

    Why using = 1...
    I believe there is no need...
    For Sum
    Formula: copy to clipboard
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    For Count
    Formula: copy to clipboard
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    Last edited by Vikas_Gautam; 10-10-2014 at 11:41 PM.
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  4. #4
    Administrator FDibbins's Avatar
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    Re: SUM array works, COUNT array does not?

    @ Vikas, yes, that works for this situation there are only 2 options - 0 or 1

    and now Im even more confused (maybe coz its late here, 20 past midnite), but deleting ALL values does not change the answers...
    A
    B
    C
    D
    E
    1
    9
    =COUNT(IF(MOD(ROW(A1:A6),2)=1,A1:C6))
    2
    1
    2
    4
    9
    =COUNT(IF(MOD(ROW(A1:A6),2)=1,A1:C6))
    3
    2
    4
    8
    9
    =COUNT(IF(MOD(ROW(A1:C5),2),A1:C5))
    4
    3
    6
    12
    5
    4
    8
    16
    6
    5
    10
    20


    and...
    A
    B
    C
    D
    E
    1
    9
    =COUNT(IF(MOD(ROW(A1:A6),2)=1,A1:C6))
    2
    9
    =COUNT(IF(MOD(ROW(A1:A6),2)=1,A1:C6))
    3
    9
    =COUNT(IF(MOD(ROW(A1:C5),2),A1:C5))
    4
    5
    6

  5. #5
    Forum Guru sktneer's Avatar
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    Re: SUM array works, COUNT array does not?

    I think to count numbers as per the criteria, the following Array Formula can be used...

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    Or this non-array formula......

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    Last edited by sktneer; 10-11-2014 at 01:34 AM.
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    Forum Moderator zbor's Avatar
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    Re: SUM array works, COUNT array does not?

    sktneer,
    no need to convert TRUE/FALSE to 1/0 with -- AND to multiply.

    It's enough to have:
    Formula: copy to clipboard
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    Any math operation will convert TRUE/FALSE into numbers (including *)
    Last edited by zbor; 10-11-2014 at 01:43 AM.
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  7. #7
    Forum Moderator zbor's Avatar
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    Re: SUM array works, COUNT array does not?

    FD,
    work for me.
    Attached Files Attached Files

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    Forum Guru sktneer's Avatar
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    Re: SUM array works, COUNT array does not?

    I think 0 in the false condition is producing the error.

    You formula could be like this.....
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    Or just leave the false condition,

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    Forum Guru sktneer's Avatar
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    Re: SUM array works, COUNT array does not?

    @zbor
    You are correct. No need to use double negative in this case.
    And You already suggested the formula in post#7 what I suggested in post#8. Didn't see it.

  10. #10
    Forum Moderator zbor's Avatar
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    Re: SUM array works, COUNT array does not?

    I've just use FDibbins's formulae as they are.
    I didn't change them and I got correct result.

    @FDibbins, check did you accidently use manual calculation in workbook.

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    Forum Guru sktneer's Avatar
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    Re: SUM array works, COUNT array does not?

    No Sir. The formula you used is different from one which Ford used originally. You removed the 0 from the formula as a false condition while Ford used 0 in his formula (Post#1). Count() will treat 0 a a number.

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    Forum Moderator zbor's Avatar
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    Re: SUM array works, COUNT array does not?

    I'm talking about FD formulae in #4, not #1.

  13. #13
    Forum Guru sktneer's Avatar
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    Re: SUM array works, COUNT array does not?

    Oh yes. He also used the same formula in post#4. In this case what you suggested about the manual calculation might be the reason behind the wrong output.

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    Re: SUM array works, COUNT array does not?

    This will work for counting values in every odd row.

    Formula: copy to clipboard
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    Forum Expert Vikas_Gautam's Avatar
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    Cool Re: SUM array works, COUNT array does not?

    I think it should be..
    Count:-
    Formula: copy to clipboard
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    Sum:-
    Formula: copy to clipboard
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    Check the attached file..
    Attached Files Attached Files
    Last edited by Vikas_Gautam; 10-11-2014 at 02:16 PM.

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    Administrator FDibbins's Avatar
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    Re: SUM array works, COUNT array does not?

    Only have a few minutes, but no, calcs were not set to manual. I will look again in an hour or so, thanks for all the inputs guys

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    Re: SUM array works, COUNT array does not?

    I think there are 2 separate issues that have arisen:

    Firstly when you use this version

    =COUNT(IF(MOD(ROW(A1:C6),2)=1,A1:C6,0))

    You get 18 because you have zero as the FALSE argument, and COUNT counts those zeroes.......but suggested fix, i.e.

    =COUNT(IF(MOD(ROW(A1:C6),2)=1,A1:C6))

    will still count blanks in A1:C6 as zeroes and so COUNT counts those too, giving 9 even if A1:C6 is completely blank

    To me there is also a "robustness" issue using ROW(A1:C6) in that you will get different results if you insert a row at row 1 - for that reason my suggested solution is this:

    =SUMPRODUCT(ISNUMBER(A1:C6)*(MOD(ROW(A1:C6)-ROW(A1),2)=1))

    That would fix all the issues with a robust non array formula
    Audere est facere

  18. #18
    Administrator FDibbins's Avatar
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    Re: SUM array works, COUNT array does not?

    DDL thanks for that, it was driving me nuts

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