[petsc-users] Question about matrix permutation

[abhyshr at mcs.anl.gov]

You can use MatGetSubMatrix. http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Mat/MatGetSubMatrix.html 
----- "Michel Cancelliere" <michel.cancelliere at polito.it> wrote: 
> Hi all, 

> 
I'm implementing a preconditioner that involves to extract some submatrices, the system matrix is of type seqbaij, and i need to permute some rows and columns before extract the submatrices. I'm trying to use MatPermute() but i should need create and additional matrix that i don't want (and it seems not to work with baij matrices), I took a look to MatGetOrdering but not sure if it fit to my case. there is any alternative to use something like MatPermute() in a seqbaij matrix but without create a new matrix? 

> 
Thank you! 

> 
Michel Cancelliere 

> 

> 
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