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Dynamic range reference

  1. #1
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    Dynamic range reference

    Hi-

    I have a sumproduct function that is aimed at a big block of data. Is there a way that I can write the function to where it will always find the last row of the data set and adjust accordingly?

    For example if right now the range is A1:G2000 and next month I add 20 rows of data I want the sumproduct ranges to automatically adjust to A1:G2020.

    Is this possible?

  2. #2
    Forum Moderator daddylonglegs's Avatar
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    Assuming every row has data you could use this as the range

    A1:INDEX(G:G,COUNTA(G:G))

  3. #3
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    Thanks Daddylonglegs. I tried that and it didn't seem to work. I will keep messing around with it though and see if I can make it work using that approach.

    Anyone else?

  4. #4
    Forum Expert NBVC's Avatar
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    How doesn't it work?

    What kind of data do you have in column G?

    Do any of these work?

    A1:INDEX(G:G,Match(9.9999999e+307,G:G))

    A1:INDEX(G:G,Match(Rept("z",255),G:G))
    Where there is a will there are many ways.

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  5. #5
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    I think it might not be working because I have some blank rows above my headers. So A1:G5 are all blank.

    Quote Originally Posted by NBVC
    How doesn't it work?

    What kind of data do you have in column G?

    Do any of these work?

    A1:INDEX(G:G,Match(9.9999999e+307,G:G))

    A1:INDEX(G:G,Match(Rept("z",255),G:G))

  6. #6
    Forum Expert NBVC's Avatar
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    That shouldn't matter...

    My formulas looks for the last entry in column G and makes that the bottom of the range...

    Did you try my formulas?

    Also, be specific about what's not working... is it just taking the wrong range? Or is it giving a specific error?

    If you still have problems, attach a workbook here.

  7. #7
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    Hi NBVC-

    Thanks for your response. Here is an example of the formula and how I'm using it.

    Take a look at the Formula tab, cell B8.

    I'm looking for a way that when I add next months data that the sumproduct functions I'm using will automatically adjust to the new, longer data set.


    Quote Originally Posted by NBVC
    That shouldn't matter...

    My formulas looks for the last entry in column G and makes that the bottom of the range...

    Did you try my formulas?

    Also, be specific about what's not working... is it just taking the wrong range? Or is it giving a specific error?

    If you still have problems, attach a workbook here.
    Attached Files Attached Files

  8. #8
    Forum Expert NBVC's Avatar
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    Try this in B8, copied down and across the table.

    Please Login or Register  to view this content.

  9. #9
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    Worked like a charm! Thanks NBVC!

    So can you explain how this function works? I like to think I am pretty good with the sumproduct functions and others as well but INDEX is a weakness as I've never learned how to use it.


    Quote Originally Posted by NBVC
    Try this in B8, copied down and across the table.

    Please Login or Register  to view this content.

  10. #10
    Forum Expert NBVC's Avatar
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    Check here for how the Index/Match functions work:

    http://www.contextures.com/xlFunctions03.html

  11. #11
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    Thank you sir... always love learning a new trick.

    Quote Originally Posted by NBVC
    Check here for how the Index/Match functions work:

    http://www.contextures.com/xlFunctions03.html

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