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Jun
15
revised Is there any way to obtain an approximate inverse for very large sparse matrices?
In the new edited version, all kinds of matrices could be considered in the question? Please also mention that how we can add comments on the written materials.
Jun
15
suggested suggested edit on Is there any way to obtain an approximate inverse for very large sparse matrices?
Jun
15
suggested suggested edit on Is there any way to obtain an approximate inverse for very large sparse matrices?
Jun
14
comment How to extract and compute on the diagonal entities of a sparse matrix very fast?
Mr. Wizard, what could be fatser than using Band[] in constructing sparse matrices of the large scale?
Jun
14
comment How to extract and compute on the diagonal entities of a sparse matrix very fast?
Thanks a lot R.M., your tip works very well. In my computer, now it takes 3.5 seconds, compared to 19 seconds at the beginning (including the time for constructing A).
Jun
14
awarded  Student
Jun
14
asked How to extract and compute on the diagonal entities of a sparse matrix very fast?
May
26
asked On the parallelization of matrix multiplications in Mathematica 8