On 2/13/24 10:53, Vinayak Vijay wrote:
The error says "You are trying to access the matrix entry with index <54,0>".
*This seems to be inconsistent with the constraint matrix* (printed in the
output above)*. *I am also attaching the sparsity pattern if needed.
Can someone help me with this? Also, since this procedure of applying
constraints in the solver routine is quite different from the usual, it would
help if someone could confirm that the above way of applying constraints is
correct and/or if there's anything else i need to keep in mind.
If you have an entry such as <54,60> and a constraint that ties DoF 60 to DoF
0, you will end up writing into entry <54,0>.
In the end, you need to ensure that when you build the sparsity pattern, you
introduce all entries you will write to. You don't show how you build the
sparsity pattern, but suspect that you call DoFTools::make_sparsity_pattern().
When you do this, you need to provide an AffineConstraints object that
includes all constraints, or you will get errors just like the ones you see.
Best
W>
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