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#1
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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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#2
Posted to microsoft.public.excel.worksheet.functions
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why does this formula have to be entered as an array formula?
Check this site for SUMPRODUCT as an alternative to array functions:
http://xldynamic.com/source/xld.SUMPRODUCT.html -- Kind regards, Niek Otten Microsoft MVP - Excel "Dave F" wrote in message ... | 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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#3
Posted to microsoft.public.excel.worksheet.functions
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why does this formula have to be entered as an array formula?
=SUM((C31:C46)*(E31:E46))-SUM(...)/2+Sum(...) + Sum(...)
If you wish, you could use just one "Sum" function as in this Array formula. =SUM(C31:C46*E31:E46,-(C47:C51*E47:E51)/2,C54:C59*E54:E59,C67:C71*E67:E71) -- HTH :) Dana DeLouis "Dave F" wrote in message ... 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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#4
Posted to microsoft.public.excel.worksheet.functions
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why does this formula have to be entered as an array formula?
Thanks
-- Brevity is the soul of wit. "Niek Otten" wrote: Check this site for SUMPRODUCT as an alternative to array functions: http://xldynamic.com/source/xld.SUMPRODUCT.html -- Kind regards, Niek Otten Microsoft MVP - Excel "Dave F" wrote in message ... | 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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