How I compute multiple sum in matlab for 4D matrix?
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
How I compute multiple sum in matlab for 4D matrices as below? U and V are 4D matrices.
12 commentaires
Réponses (1)
Matt J
le 11 Sep 2018
Modifié(e) : Matt J
le 11 Sep 2018
Notice that the only indices shared between U and V are j and q. Therefore, you can minimize multiplication operations as follows,
partialU=sum(sum(U,4),1); %sum over i and r
partialV=sum(sum(V,4),1); %sum over k and s
A=sum(partialU(:).*partialV(:)); %sum over j and q
6 commentaires
Matt J
le 11 Sep 2018
Modifié(e) : Matt J
le 11 Sep 2018
You should edit your original post with this new equation and information about q_r and q_s. The new expression is rather unclear. You have the symbol q being used for two different things, both as a symbolic variable and as an index of summation.
Voir également
Catégories
En savoir plus sur Matrix Indexing dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!