Generating sequence numbers from cluster values [VLOOKUP to the rescue]

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Last night I got an email from Joshua, one of our readers with the subject – Hard Excel problem. Hard?!?, at this stage of summer, the hard problems seem to be (in no particular order),

  1. Lack of good quality mangoes to eat
  2. Intense heat and humidity
  3. Lack of good quality mangoes to eat

Yes, I like mangoes.

Any how, back to Joshua’s email, So I got curious and read it. He is facing an interestingproblem.

I have a very difficult inquiry I am hoping you might be able to solve…

Is there a formula (i.e., without using VBA) that will look at another columns values and provide a new sequential number (i.e., reordered) when the value changes; however, keep the same sequential number for the duplicates?

Below is a table with two columns. […] I now need to rank order those cluster groups. Since cluster 12 appears first it would get a value of ‘1’ and all of the cluster 12’s should now be a ‘1’. Since cluster 4 appears next it would get a rank of 2, etc…

generate-squence-numbers-problem

Well, it is an interesting problem for sure. But hard problem, it isn’t. For really hard problems, refer to my list above.

So how to generate the sequence numbers?

Logic: If a value is already listed, we fetch corresponding sequence number. Else, we generate a new sequence number.

Implementation: Simple, we use VLOOKUP.

Assuming the cluster values are in column B, from B4 onwards, in C4, write

=IFERROR(VLOOKUP(B4,$B$3:C3,2,FALSE), SUM(MAX($C$3:C3),1))

Let’s examine the formula.

VLOOKUP(B4,$B$3:C3,2,FALSE) portion: This one looks value in column B and tries to find corresponding sequence value in column C.

SUM(MAX($C$3:C3),1) portion: Gives us next sequence number

IFERROR(VLOOKUP(…), SUM(…)) portion: This does the magic of choosing either existing sequence number or generating a new one.

For more, read about VLOOKUP and IFERROR formulas.

sequence-generation-formula-explained

Sequence number generation – Example spreadsheet

Play with the sequence number generation spreadsheet embedded below or Click here to grab a copy of the file.

How would you generate the sequence numbers?

Its your turn to take a crack at the hard problem. How would you solve it? Go ahead and share your answers in the comments.

More hard problems – solved:

Hard problems are not new at Chandoo.org. We take lob vlookups and sumproducts regularly to crack them. Here are few examples:

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22 Responses to “Master Excel 2007 Ribbon with this Free Learning Guide”

  1. Finnur says:

    Thank you, kind sir. Well done with the baby making.

  2. doug churchill says:

    I cannot get signed up for your newsletter. I tied both this email address and churchill2001@hotmail.com. never a response.

  3. doug churchill says:

    I cannot get signed up for your newsletter. I tied both this email address and churchill2001_at_hotmail_dot_com. never a response for either attempt.

    • Chandoo says:

      @Doug, it shows that your email address is pending verification. Can you check your inbox (and may be spam folder too) for an email from me? The subject will be "Activate Subscription to Get your Free Excel Tips E-book"

  4. ajay says:

    Very Useful Info..Keep it up..

  5. Chandoo says:

    @Ajay.. you are welcome 🙂

  6. [...] Excel 2010 UI looks considerably better and less stressful than 2007. The colors are dull and subtle. The icons don’t call for attention unless you want to do something. The menus / ribbons feel smoother and slicker. [Learn to use Excel Ribbon with this Free e-Book] [...]

  7. Mark says:

    I can't open this pdf. I get the error message:

    You do not have the required license to open this file.

    Please request a license from the creator of the file, and add it using the license manager and they try opening it again.

    What gives??

  8. Mark says:

    I downloaded the file again and it worked this time. Strange. (First file was 116 KB, second was 1644 KB... ???)

  9. Michael says:

    Hi Chandoo,
    thanks for sharing your Excel 2007 learning experience with us; unfortunately the link to the pdf of the free Excel 2007 learning guide seems broken: my Acrobate Readers flags: "Unkown file type or corrupte data".
    Have a nice day
    Michael

  10. anja says:

    well done this is great

  11. Fabian says:

    Can somebody just provide a link the classic TAB exportedUI files for MS Office 2003 for us to use in office 2007/2010?. searching online, everybody just wnats to make a buck online with silly Classic Tab installers which do nothing more than inport exportedUI files for you.

    Don't give me a ribbon how to guide, just give me free exportedUI files. I should not have to pay anyone for this, it is free XML, MS should have included this to begin with.

  12. rocky says:

    thanks

  13. kartik says:

    Dear.
    There are a set of debit values and a set ot credit values in a column. I want a vba code by whcich the debit value plus a single / multiple credit value is zero that needs to be marked .
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    If multiple matching sets are available let it take the 1st or the 2nd one its not an issue.
    Column A Ref
    -1000 A
    -5000 B
    -8000 C
    800 A
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    2000 B
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    13000
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  14. ridwan says:

    hi...
    how to make this add-ins and display in ribbon... check this sample : http://www.cprsoft.com/GCDemo01.htm
    thank you sir...
     

  15. Aleem Qamar says:

    Please tell me format painter short cut key In excel ?
    Thanks In Advance

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