google-sheetscountgoogle-sheets-formulavlookuparray-formulas
What should be the Arrayformula at D1 to get the column D?
Column A contains only unique value.
I have actually achieved this using two formulas:
(i) Arrayformula at B1:
={"ARRAYFORMULA 1";ARRAYFORMULA(if($A2:$A = "",,countifs(countifs($A2:$A, $A2:$A, row($A2:$A), "<=" & row($A2:$A)), 1, row($A2:$A), "<=" & row($A2:$A))))}
(ii) Formulas at column B:
=INDEX(FILTER(B$1:B2,B$1:B2<>""), COUNTA(FILTER(B$1:B2,B$1:B2<>"")))
(1) Why doesn't Arrayformula version of this formula doesn't work:
=Arrayformula(INDEX(FILTER(B$1:B2,B$1:B2<>""), COUNTA(FILTER(B$1:B2,B$1:B2<>""))))
(2) I am not able to get a single Arrayformula to produce my result. What Arrayformula should I use at D1 to my desired results?
Solution
try:
=ARRAYFORMULA(SORTN(COUNTIFS(COUNTIFS(A2:A, A2:A,
ROW(A2:A), "<="&ROW(A2:A)), 1,
ROW(A2:A), "<="&ROW(A2:A)),
MAX(ROW(A2:A)*(A2:A<>""))-ROW(A2)+1, 0, 1, 1))
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