transforming a 2-dim array integers to 3-dim array of logical which are true for the corresponding number - without using a loop
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hello,
I would like to take an 2-dim array like
IND=[4 3 2;
1 2 3];
and create a 3-dim of logicals like
GOAL(:,:,1)=[0 0 0 1;
1 0 0 0]
GOAL(:,:,2)=[0 0 1 0;
0 1 0 0]
GOAL(:,:,3)=[0 1 0 0;
0 0 1 0]
So the first second dimension is newly created, it is as long as the highest number in IND and is zero(false), except for the indice, that is 1(true)
I really need it to be fast, so a for loop will not do.
Many thanks Marcus
2 commentaires
Réponse acceptée
Bruno Luong
le 22 Oct 2018
Modifié(e) : Bruno Luong
le 22 Oct 2018
IND=[4 3 2;
1 2 3];
[I,~,K] = ndgrid(1:size(IND,1),1,1:size(IND,2));
J = IND;
GOAL = accumarray([I(:),J(:),K(:)],1);
3 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Creating and Concatenating Matrices 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!