[petsc-users] How can I convert parall matrix to MATSEQDENSE

[Jed Brown]

Cong Li <solvercorleone at gmail.com> writes:

> Hi, all
>
> Could someone tell me how I can convert a parallel MATDENSE (or MATMPIAIJ)
> matrix to a MATSEQDENSE matrix?

Get the array and use MPI_Gather.  With MATMPIAIJ, you almost certainly
should not compute an explicit inverse.

> I need this converted sequential matrix for direct solver to get its
> inverse matrix.

You can do that with Elemental without needing to serialize the matrix
inversion.  Also, why do you need an explicit inverse?
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