On 8/19/22 05:46, Simon Wiesheier wrote:
This system boilds down to a 2x2 system for x1 and x2 with x0=0.
This is exactly what I want to compute, but without having -c*K10 substracted.
(Because the new rhs comes from a different problem and has nothing to do with
the constrainted dofs - I just need the 2x2 portion from the original problem)
Right. But c*K10 is subtracted from the right hand side when you call
constraints.distribute_local_to_global (...)
It is not magically stored somewhere. When you solve a new linear system with
the matrix, that linear system knows nothing about what happened when you
first built the matrix and the original right hand side.
Best
W.
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