sparse function is intrisically slow?
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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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James Tursa
2020년 5월 12일
OK. Are the values in the double vector stored in the same memory order as the sparse matrix columns? Can you give a small example of your indexing and values vector? I'm asking all of these questions to see if a mex routine could work for you.
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Robert
2020년 12월 24일
I was able to speed my sparse matrix build for very large problems by using sparse2.m (mexFunction) from SuiteSparse.
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Yingzhi Liu
2022년 3월 19일
I downloaded SuiteSparse, but I don't konw how sould I do to use sparse2.m in matlab. Can you help me list the steps after downloaded SuiteSparse? Thanks.
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