Sparse matrix memory problem
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I need to create really big sparse matrix, which will have very few non zero elements. I am trying to do this callling function:
A = sparse([1], [1000000000], 1);
But Matlab then allocates 7GB of memory! I think sparse matrices uses memory only for non zero elements, but it seems it allocates full matrix. Am I doing something wrong or this is Matlab bug? How can I bypass it?
0 commentaires
Réponse acceptée
Teja Muppirala
le 5 Avr 2012
Sparse matrices keep track of data by each column. This means that if you have a lot of columns (here you have one billion of them...), then you will need lots of memory even though it is sparse. A workaround would be to make it a single column vector with 1e9 rows instead.
A = sparse(1000000000, 1, 1);
0 commentaires
Plus de réponses (1)
Voir également
Catégories
En savoir plus sur Sparse 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!