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Index from bottom to top

  1. #1
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    Index from bottom to top

    Hello all,

    I'm working on a formula that will check column D, from bottom to top, for a number entered in column D, and will return the date in column A. So far, the formula I have is

    =IFERROR(INDEX($A:$D,MATCH(D2,D:D,0),1),"")

    It works, but it works from top to bottom. Is there any easy way to make it go from bottom to top?

  2. #2
    Forum Expert tim201110's Avatar
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    Re: Index from bottom to top

    =IFERROR(INDEX($A:$D,MATCH(D2,D:D),1),"")
    if data in D:D in ascending order

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    Forum Moderator Glenn Kennedy's Avatar
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    Re: Index from bottom to top

    =LOOKUP(10^300,$a$2:$a$100/($d$2:$d$100=d2))

    if this isn't right...

    Will you please attach a SMALL sample Excel workbook (10-20 rows of data is usually enough)? Please don't attach a picture of one (no-one will want to re-type all your stuff before starting).

    1. Make sure that your sample data are truly REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.

    2. Make sure that your desired solution is also shown (mock up the results manually).

    3. Make sure that all confidential information is removed first!!

    4. Try to avoid using merged cells. They cause lots of problems!

    Unfortunately the attachment icon doesn't work at the moment. So, to attach an Excel file you have to do the following: Just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.
    Glenn



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    Re: Index from bottom to top

    I forgot a key part of this, and that's my fault. The formula needs to ignore the row that it's in. The formula Tim gave works perfectly, but it includes the line that the formula is in, which won't work for what I'm trying to do.

    I tried attaching a file, but when I press the attach button it just shows me a white line.

  5. #5
    Forum Moderator Glenn Kennedy's Avatar
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    Re: Index from bottom to top

    Unfortunately the attachment icon doesn't work at the moment. So, to attach an Excel file you have to do the following: Just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.

    And how did my formula fail??

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    Re: Index from bottom to top

    Let's see if this works.

    And your formula kind of worked. But it was doing the same thing as Tim's: It's not ignoring the data in column A in the column that it's in.

    In an ideal world, what will happen is data will get put into a cell in column D. If that data has been entered into a previous row in column D, the formula will pull the data from column A from the previous row.

    I can do this no problem with a macro that runs on sheet change, but they want this done with just a formula for one reason or another.
    Attached Files Attached Files

  7. #7
    Forum Moderator Glenn Kennedy's Avatar
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    Re: Index from bottom to top

    In I2, an arrat formula, copied down:

    =IF(COUNTIF($D$2:D2,D2)>1,INDEX(Sheet1!A:A,LARGE(IF($D$2:D2=D2,ROW($D$2:D2)),2)),"")

    Array Formulae are a little different from ordinary formulae in that they MUST be confirmed in the FIRST CELL ONLY by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. After that, the array can be dragged down as normal, to cover the desired range.

    You will know the array is active when you see curly brackets { } - or "curly braces" for those of you in the USA, or "flower brackets" for those of you in India - appear around the outside of your formula. If you do not use CTRL+SHIFT+ENTER you will (almost always) get an error message or an incorrect answer. Press F2 on that cell and try again.

    Don't type the curly brackets yourself - it won't work...

  8. #8
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    Re: Index from bottom to top

    I can't say that I understand it, but this works beautifully. You just saved me a huge headache, thank you very much!

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