building a diagonal matrix from another matrix!
4 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Hi eveybody,
im trying to build a diagonal matrix from another matrix in general form like following:
A=[a b,c d] -----> B[a 0 0 0,0 b 0 0,0 0 c 0,0 0 0 d]
dont want to write each array using blkdiag( ) function becuase my aimed matrix is too big.
tnx
1 Commento
Jos (10584)
il 7 Mar 2014
What are a,b,c, and d? scalars or matrices?
What do you mean by "too big"? Did you consider using sparse storage using, for instance, SPDIAGS?
Risposta accettata
Jos (10584)
il 7 Mar 2014
A = 1:5 ;
B_sparse = spdiags(A(:),0,numel(A),numel(A))
B_full = diag(A)
isequal(full(B_sparse),B_full)
0 Commenti
Più risposte (0)
Vedere anche
Categorie
Scopri di più su Operating on Diagonal Matrices in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!