Formula for tabulating daily running counts of a given column

问题

I'm trying to write a formula that gives a running count of Issues for a given day. In other words: the output should enumerate each Issue for a given date (returning blank if Issue is blank), and then start again at 1 for the first issue in a subsequent date.

I've hard-coded the expected outputs in the "desired output" column (column I):

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Sample dataset is in this sheet. Key pieces:

• Column B contains the date
• Column E contains the T-shirt size severity of each Issue
• Column F contains a numerical translation of column E
• Column G contains a binary output of whether there was an Issue

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In my attempt (column J), I've gotten close using

=ArrayFormula(MMULT((ROW($B3:$B)>=TRANSPOSE(ROW($B3:$B))) * EXACT($B3:$B,TRANSPOSE($B3:$B))^1, ($G3:$G)^1))

...but it's not quite what I want, as:

1. this repeats values instead of giving blanks (e.g. row 8, 11)
2. this gives 0s instead of giving blanks (e.g. row 3, 4)

See Validation (column L).

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Any ideas on how to get to what I'm looking for?

回答1:

Just wrap your formula in the IF function

=ArrayFormula(IF(F3:F="",,YOUR.....FORMULA))

In other words

=ArrayFormula(IF(F3:F="",, 
                   MMULT((ROW($B3:$B)>=TRANSPOSE(ROW($B3:$B))) * EXACT($B3:$B,TRANSPOSE($B3:$B))^1, ($G3:$G)^1) 
                      ))

来源：https://stackoverflow.com/questions/63893967/formula-for-tabulating-daily-running-counts-of-a-given-column