[petsc-users] Copy data from MATMPIAIJ to MATSEQDENSE

[Thomas Witkowski]

Whats the best way to copy data from a MATMPIAIJ to a local  
MATSEQDENSE? The problem with MatGetSubMatrix seems to be that both  
matrices must have the same communicator. But the MATMPIAIJ has, say,  
PETSC_COMM_WORLD, but the MATSEQDENSE has PETSC_COMM_SELF. If it is  
simpler to extract subvectors from MATMPIAIJ to VECSEQ, this would to  
the same for me.

Thanks,

Thomas