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Faster if/countif formula for flagging uniques - countif too slow

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    Faster if/countif formula for flagging uniques - countif too slow

    Hello. I have a spreadsheet of about 100k rows and need a formula to provide a 1 for the first unique value encountered in order to accurately feed into a pivot table for number of unique values.

    The formula currently in use is
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    Unfortunately, with the number of rows I have in this sheet, this formula basically just crashes excel whenever I try to change anything.

    I have tried
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    as well which is certainly faster, but still very slow


    I am open to VBA solutions as well.


    Ideas?
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    Re: Faster if/countif formula for flagging uniques - countif too slow

    Hi,

    Can you not use the INDEX option available under "Value Field Settings" of the Pivot Table if you are just trying to calculate the Unique Counts?

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    Re: Faster if/countif formula for flagging uniques - countif too slow

    I see no such option? I am using Excel 2010 x64

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    Re: Faster if/countif formula for flagging uniques - countif too slow

    See the snapshot below, check if this option is available in your office version. I have also attached an example file.
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    Re: Faster if/countif formula for flagging uniques - countif too slow

    If you are still looking for a formula solution have you tried FREQUENCY / MATCH? I have never tried FREQUENCY / MATCH over that many rows. It is unexpectedly fast. It would have to be array committed over the entire range at once though.

    Something like this in column C.


    =IF(FREQUENCY(MATCH($B$1:$B$100000,$B$1:$B$100000,0),ROW($B$1:$B$100000)),1,"")


    I'd be curious to hear how this does over that many rows.

    Edit: Curiosity got the best of me. I tried it with 100,000 rows of junk data. It took less than 3 seconds.

    Update: This speed seems to depend on the complexity and number of unique items in the list.
    Last edited by FlameRetired; 08-20-2015 at 04:45 PM.
    Dave

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