how to inverse a sparse matrix in Petsc?

Waad Subber w_subber at
Mon Feb 4 19:58:31 CST 2008

There was a discussion between Tim Stitt and petsc developers about matrix inversion, and it was really helpful. That was in last Nov. You can check the emails archive


Yujie <recrusader at> wrote: what is the difference between sequantial and parallel AIJ matrix? Assuming there is a matrix A, if I partitaion this matrix into A1, A2, Ai... An.
A is a parallel AIJ matrix at the whole view, Ai is a sequential AIJ matrix? I want to operate Ai at each node. 
 In addition, whether is it possible to get  general inverse using MatMatSolve() if the matrix is not square? Thanks a lot.

On 2/4/08, Barry Smith <bsmith at> wrote: 
    For sequential AIJ matrices you can fill the B matrix with the
identity and then use

    Note since the inverse of a sparse matrix is dense the B matrix is
a SeqDense matrix.


On Feb 4, 2008, at 12:37 AM, Yujie wrote:

> Hi,
> Now, I want to inverse a sparse matrix. I have browsed the manual,
> however, I can't find some information. could you give me some advice?
> thanks a lot.
> Regards,
> Yujie


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