Σ N-ary summation

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Permalink Reply by Edward Fransen on November 9, 2017 at 3:47am

Hi,

Has anyone figured this out already? I have encountered the same problem. I want to sum the multiplication of two lists of values within an expression, but all it seems to do is multiply the entries which have the same index and return a list of values.

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• Summation.JPG, 92 KB

Permalink Reply by Pieter Segeren on November 10, 2017 at 3:39am

Hi Edward, I think you might want to use [Mass Addition] (in the Maths > Operators tab)

Permalink Reply by Edward Fransen on November 10, 2017 at 5:59am

Yes that also works, thanks for your reply!

Still wondering though how the summation demands its input for it to work properly.

Permalink Reply by David Rutten on November 10, 2017 at 6:15am

∑(1,2,3,4,5,6,7)

would be 28

Permalink Reply by Pieter Segeren on November 10, 2017 at 6:27am

"Also"?? ;)
Notice that the second use of the ∑ in your expression is superfluous: you cannot sum a single value.

Permalink Reply by Edward Fransen on November 10, 2017 at 6:55am

Okay so I should split my list into separate indices for the summation to work.

@Pieter: Yes you are correct. The second ∑ in the formula is for possible changes in the design due to which there might be more values to add.