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I have a LibreOffice Calc spreadsheet which has this structure

  APPLES     ORANGES    BANANAS
          5         0          10
         15         2          12
          3         2         105
          2         6          10
          2         0          20
          5         6          20

Let's say there are R data rows in this sheet, one per day. I want to aggregate this to get numbers per N days. This derived sheet will have R/N rows.

To get per-week totals, we have N=7. For the sake of illustration, let's pretend that we are doing this for N=2, then the new sheet looks like this

  APPLES     ORANGES    BANANAS
        20          2          20
         5          8         115
         7          6          40

How do I do this?

  • 1
    A quick and dirty approach is to add a helper column. Populate that with "group" numbers. You could generate that with a simple formula or just count and do it manually. Then use a pivot table to aggregate on the helper column. – fixer1234 Jan 30 '18 at 21:38

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