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
