On 10/28/23 13:41, Mathieu wrote:
What do you think is an appropriate data structure for the storage of the
entries associated with the constrained dofs? A FullMatrix or a separate
AffineConstraints?
Later, I have to somehow merge this data structure with the condensed system
matrix since I have to solve a linear system with it.
The storing it as a sparse matrix seems reasonable. Its sparsity pattern is a
subset of the sparsity pattern of the system matrix. If you just want to get
things working, then using the same sparsity pattern is going to be a quick
solution though it wastes a substantial amount of memory. If you want to put
some more work in, you can relatively easily determine which rows and columns
need to be stored.
Best
W.
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Wolfgang Bangerth email: [email protected]
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