Extracting row elements from different columns using an index
8 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I have two 18x4 matrices of various integer sized data (say A and B). I am trying to collapse the second matrix (B) into an 18x1 array using an index created by the first matrix (A), the index which is that of the largest integers in each row of the first matrix (A).
I've attempted to do this by using an [~,idx] = max(A,[],2), but am having some trouble extracting the data out of B using the index. Is there a way to do that, or an even better approach?
I am attempting to use the logic I find here to apply to two 5D matrices collapsed along the 5th dimension by minimum value.
Thank you.
0 commentaires
Réponse acceptée
Fangjun Jiang
le 13 Oct 2011
A=rand(18,4);
B=rand(18,4);
[Ma,indA]=max(A,[],2);
indB=sub2ind(size(A),(1:size(A,1))',indA);
Sb=B(indB)
0 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Matrix Indexing dans Help Center et File Exchange
Produits
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!