Sum factorized Block Preconditioner
Allows the symbolic extraction of the block diagonal of a DG operator as well as the (rank 1) point diagonal of that blockdiagonal. Sum factorized matrixfree evaluation of both of these is implemented.
Allows the symbolic extraction of the block diagonal of a DG operator as well as the (rank 1) point diagonal of that blockdiagonal. Sum factorized matrixfree evaluation of both of these is implemented.