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why does this formula have to be entered as an array formula?
Here's the formula:
=SUM((C31:C46)*(E31:E46))-SUM((C47:C51)*(E47:E51)/2)+SUM((C54:C59)*(E54:E59))+SUM((C67:C71)*(E67:E71 )) My guess is that these are matrices being multiplied together and matrix algebra is different than straight multiplication. So, Excel requires CTRL+SHIFT+ENTER to tell its calculation enginge to do matrix multiplication.... Am I correct here? Also: it seems to me that the same calculation can be done with SUMPRODUCT. Dave -- Brevity is the soul of wit. |
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