问题
I'm trying to count the number of times something of a given type occurs and I need this behaviour to automatically expand to inserted rows. Something like:
=Arrayformula(COUNTIFS(I:I,I:I,H:H,H:H,G:G,G:G))
The nested countif formula will result in a correct value when used on a single row but currently the array formula is outputting 1 all the way down.
My data resembles:
Column1 Column2 Column3 Result
--------------------------------------------
apple green eaten x
orange orange noteaten x
apple red eaten x
orange orange noteaten x
apple green eaten x
...
The x column is where the arrayformula would output.
X on Row 1 should look through all the data and count up the number of green apples eaten, the next row would count noneaten orange oranges, and so on. I know that arrayformula doesn't take aggregate functions but I didn't find anything on alternatives to countif.
回答1:
Unfortunately, in Google Sheets, COUNTIFS can not be iterated over an array, as eg COUNTIF can (at the time of writing this, anyway).
You would need to resort to MMULT, something like:
=ArrayFormula(IF(ROW(G:G)=1,"Result",MMULT((G:G=TRANSPOSE(G:G))*(H:H=TRANSPOSE(H:H))*(I:I=TRANSPOSE(I:I)),SIGN(ROW(G:G)))))
but be aware there appears to be a limitation in Sheets whereby the 2D array formed by G:G=TRANSPOSE(G:G) etc cannot exceed 10 million elements. This corresponds to a maximum of 3162 rows.
Another option is to use concatenation of strings:
=ArrayFormula(COUNTIF(G:G&CHAR(9)&H:H&CHAR(9)&I:I,G:G&CHAR(9)&H:H&CHAR(9)&I:I))
which gets around the "3162" limitation. CHAR(9) is a tab character, but it could be any character that you are certain will not appear in your data.
来源：https://stackoverflow.com/questions/29203247/using-countifs-in-an-array-formula