[petsc-users] sparse matrix addition

[Shiyuan]

Hi,
    I have two matrices A, B of different nonzero-pattern. Their size is
about 60k*60k. I notices that MATAXPY() is extremely slow. However, In
matlab, addition of the same two matrices is done in no time. Why is so? Any
strategies to speed up the sparse matrices additions? Thanks

Shiyuan
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