在sumproduct函数中使用vlookup或索引匹配

Question

I have two 2-D arrays that relate to engines. The first table classifies an Engine as either a or as b . The second table has a numerical count value for each of the engines.

I want to calculate the number of engines for each label. Here, label a has a count of 40 and label b has a count of 300.

I thought the following formula would work...

=SUMPRODUCT(
            --(E3=VLOOKUP(A11:A17,A2:B8,2,0)),
            B11:B17
           )

...but it does not!

Why can't I use a vlookup inside a sumproduct array formula? Index-match also doesn't work.

I can't append a new column to the second table with a vlookup forumla that references the first table.

Answer 1

Use LOOKUP:

=SUMPRODUCT(($B$2:$B$8=E3)*LOOKUP($A$2:$A$8,$A$11:$A$17,$B$11:$B$17))

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To do it with unsorted data use this array formula:

=SUM(SUMIF($A$11:$A$17,IF($B$2:$B$8=E3,$A$2:$A$8),$B$11:$B$17))

Being an array formula it must be confirmed with Ctrl-Shift-Enter instead of Enter when exiting edit mode. If done correctly then Excel will put {} around the formula.