[petsc-users] Insert one sparse matrix as a block in another

[Mark Adams]

Do you know what kind of solver works well for this problem?

You probably want to figure that out first and not worry about efficiency.

MATCOMPOSITE does what you want but not all solvers will work with it.

Where does this problem come from? We have a lot of experience and might
know something.

Mark

On Mon, Dec 12, 2022 at 1:33 PM Peder Jørgensgaard Olesen via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hello
>
>
> I have a set of sparse matrices (A1, A2, ...) , and need to generate a
> larger matrix B with these as submatrices. I do not know the precise sparse
> layouts of the A's (only that each row has one or two non-zero values),
> and extracting *all* values to copy into B seems incredibly wasteful. How
> can I make use of the sparsity to solve this efficiently?
>
>
> Thanks,
>
> Peder
>
>
>
> Peder Jørgensgaard Olesen
> PhD student
> Department of Civil and Mechanical Engineering
>
> pjool at mek.dtu.dk
> Koppels Allé
> Building 403, room 105
> 2800 Kgs. Lyngby
> www.dtu.dk/english
>
>
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