Sparse Matrix indexing
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I need to built a sparse matrix for large matrix in order to avoid entering out of memory. Can a sparse matrix be build like: n=792;m=1000;j=2; A=sparse((n+3)*j+1,(3*n+m-1)*j); %then filling up this zero matrix with ones at certain rows and %columns like A(1:n*j,1:n*j)=eye(n*j,n*j);
I know this will increase the execution time but this will save me lot memory right?. Is there any other method I can perform
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Titus Edelhofer
2011-6-14
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Hi Samir,
more or less that's the way to go. Take a look at the function speye, spdiags and the others under "See also" that help build up your matrix (in your example "eye" is a full matrix, whereas you want only to set the diagonal).
Titus
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