[deal.II] convert BlockSparseMatrix to SparseMatrix

[陈敏]

Hi everyone,

Is it possible to convert BlockSparseMatrix to SparseMatrix in deal.ii?

If so, Is it possible to convert LA::MPI::BlockSparseMatrix to LA::MPI::SparseMatrix in deal.ii? and what should I do to dof_handler and Sparse_pattern?

best,

chen

[SebG]

Dear Chen,

I guess that the namespace LA::MPI refers to PETScWrappers or PETScWrappers or TrilinosWrappers (without MPI). According to my knowledge, the answer to the first two question is no. Regarding the DoFHandler, a component wise or block wise renumbering of the degrees of freedom is usually performed when block systems are used. The SparsityPattern is replaced by a BlockSparsityPattern. You may consider one of the tutorial programs on the Stokes problem for details.

Best wishes,

Sebastian