sparse function is intrisically slow?

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Jiangtao Lu
Jiangtao Lu on 7 May 2020
Answered: Robert on 24 Dec 2020
I am building the sparse matrix using the function sparse(I,J,V,N,N)
I, J and V are already a column vector. I checked previous questions, it seems already being the best way. But, it takes extreamely long time if the size goes to 1E5.
Any way out? Thanks!
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Jiangtao Lu
Jiangtao Lu on 12 May 2020
I am not clear to that question. The calculation is like:
work.jacValueIndex = numC*(work.g(work.J)-1)+work.I;
jacValue = df(work.jacValueIndex)./dc(work.J);
jac = sparse(work.I,work.J,jacValue,numC,numC);
I attached an example of work and jacValue

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Answers (1)

Robert
Robert on 24 Dec 2020
I was able to speed my sparse matrix build for very large problems by using sparse2.m (mexFunction) from SuiteSparse.

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