> On Jan 21, 2015, at 12:56 PM, Chung-Kan Huang <[email protected]> wrote: > > Hi, > > So if I do > You need to set the block size on the original matrix before you convert.
> Mat A, AB; > MatCreateAIJ(comm,m,n,M,N,d_nz, d_nnz,o_nz, o_nnz, &A); > MatConvert(A, MATBAIJ, MAT_INITAL_MATRIX, &AB); > MatSetBlockSize(AB, bs) > I can create AB as a BAIJ with block size of bs from A which is a AIJ matrix. > > So from this point I can use both A and AB and they will mean the same > matrix. Am I right? They will have the same values but be different matrices and use different memory. > > At the end of the program do I only destory one of them or both? Both > > Do I need to worry about anything in terms of memory penalty? It uses roughly twice as much memory. > > > Thanks, > > Kan > > > On Tue, Jan 20, 2015 at 4:39 PM, Barry Smith <[email protected]> wrote: > > You can do a MatConvert() (requires another copy of the matrix) for the > parts that benefit from BAIJ. > > Barry > > > On Jan 20, 2015, at 4:33 PM, Chung-Kan Huang <[email protected]> wrote: > > > > Hi, > > > > Does PETSc provide means for conversion between AIJ & BAIJ. > > > > My matrix is created as AIJ because it makes life easy for most part of the > > applications but some part of applications actually get some benefits with > > BAIJ. So I wonder if a matrix can exist as two idenfities and I can use > > either format depend on which one is more convenient at run time. > > > > So in my case the block size is fixed and identical for all blocks. > > > > > > Thanks, > > > > > > Kan > > > > > -- > Cheers >
