[petsc-users] get sub matrix from MPIBAIJ with MatCreateSubMatrix

[Xiangdong]

Hello everyone,

I have a question about get the sub matrix Aodd from a MPIBAIJ matrix A.
For example, if the bs=2 and the matrix size is 10x10. How can I get the
5x5 submatrix corresponding to the odd rows and odd columns only?

I tried to use the MatCreateSubMatrix, but get the error messages "Index
set does not match blocks". It seems that MatCreateSubMatrix can only
provide the whole block, instead of just a specific component of that block.

Can you give me some suggestions on extracting the submatrix corresponding
to a specific component?

Thank you.

Best,
Xiangdong
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