Performing sums with several indexes

Performing sums with several indexes - Messages

#1 Posted: 9/13/2021 12:24:35 PM
Terje B

Terje B

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Could someone point me in the correct direction regarding evaluations of such sums:

Sums.gif



Terje
#2 Posted: 9/13/2021 1:01:16 PM
Oscar Campo

Oscar Campo

124 likes in 298 posts.

Group: Moderator

Wrote

Could someone point me in the correct direction regarding evaluations of such sums:

Sums.gif



Terje



Hi,
for reproducing that formula, just type:

el(η,m):sum(el(K,i)*(1+2*sum(el(H,i,j)*el(K,j),j,1,i-1)+sum(sum(el(H,j,k)*el(H,i,k)*el(K,j)*el(K,k)*(j≠i)*(k≠i),k,1,n),j,1,n)),i,1,n)

to obtain:

indexes.png

Regards,
Oscar.
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