Matlab out of memory when use index to access an element of an array
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Here is my code:
rows = zeros(round(a large number),1);
cols = rows;
vals = rows;
.....(calculation)
rows(idx) = (i-1)*p + j;
cols(idx) = col;
vals(idx) = d;
Here, idx, pj, col, d are four arrays of the same size. The first indexing line (rows(idx) = (i-1)*p + j;) gets no problem. But when excuting the next line, it comes the problem "out of memory".
I set a breakpoint and debug here. After excuting "rows(idx) = (i-1)*p + j;", i tried "cols(1)=1", it also got the out of memory problem. Could someone pleas explain this problem to me? Thanks a lot!
0 commentaires
Réponse acceptée
Matt Fig
le 6 Déc 2012
Modifié(e) : Matt Fig
le 6 Déc 2012
You are probably seeing copy-on-write behavior. When you first assign the value of rows to cols, MATLAB doesn't actually create cols, but rather a pointer to rows. It is only when you change a value in cols that MATLAB (tries to) create cols. This is when you run out of memory.
0 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Whos 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!