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Using Offset function, want automatic update of 30 points of most recent data

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    Using Offset function, want automatic update of 30 points of most recent data

    Hi,

    I have a spreadsheet with approximately 20 columns of numerical data (including some blank cells) which I update with more daily values every couple of days. One of the columns is the date. There are around 800 data-points in each column.
    I use offset and counta to define the ranges of the columns which means my line and scatter charts update automatically as I input more data:

    OFFSET('Sheet 1'!$K$4,0,0,COUNTA('Sheet 1'!$K:$K)-1)

    I want to somehow automatically select the last 30 data points to use in the charts, I want these 30 data points to automatically update as I add more data. Is there a formula I can use to do this, or do I need to visit the world of VBA?

    Thanks
    Bob

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    Re: Using Offset function, want automatic update of 30 points of most recent data

    Try:
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    Ben Van Johnson

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    Re: Using Offset function, want automatic update of 30 points of most recent data

    Try

    OFFSET('Sheet 1'!$K$4,COUNTA('Sheet 1'!$K:$K)-31,0,30)
    ChemistB
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    Re: Using Offset function, want automatic update of 30 points of most recent data

    =OFFSET(INDEX(K:K,LOOKUP(2,1/((K1:K100<>"")*1),ROW(K1:K100))),,,-30,1)
    try this
    Samba

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    Re: Using Offset function, want automatic update of 30 points of most recent data

    or try
    =OFFSET(INDEX(K:K,LOOKUP(2,1/((K:K<>"")*1),ROW(K:K))),,,-30,1)

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    Re: Using Offset function, want automatic update of 30 points of most recent data

    Thank you guys, all these work well.

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