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Different performance using mldivide, how to speed up my application?

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I use mldivide to solve a system's equation, eg fsol = kk \ fn. Depending on how I form the system's matrix,kk, I have a change in mldivide performance.
My code adresses fem analysis. kk is a sparse matrix. When I use kk(nd,nd) = kk(nd,nd) + k, where nd is 1x4 matrix, it is slower to form the kk matrix, but for some reason the fsol = kk \ fn runs much faster, than the case I use separate matrices to store the indices and values and form the kk matrix as kk= sparse(I,J,val).
It probably has something to do with memory allocation, but I have no idea how to solve the problem. Could someone give me some insight as to how to control the overall process?
Thank you.
  2 Kommentare
Walter Roberson
Walter Roberson am 15 Jan. 2016
If nd is 1x4 then kd(nd,nd) would be addressing 16 locations, not 4 locations. Is that your intention?

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