I wasn't sure if I should start a new thread as this is a very related and
basic question. Before I got the impression that switching from an exact LU
(UMFAPCK) to an ILU would be a good first try when UMFPACK started too much
memory for my problem. However, it appears that the SparseILU class does not
play nicely with BlockSparseMatrix.
That is correct. But if you want to just build a preconditioner for the entire
matrix, then there is also no reason to substructure the matrix into
individual blocks -- you might as well work with one matrix and one vector
that correspond to all variables at once.
Block matrices/vectors are a tool to build preconditioners that work on
specific blocks of a matrix. If that's not your goal, there is no need to use
this tool.
Best
W.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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