On 11/28/2017 02:33 PM, Jie Cheng wrote:
Because the global stiffness matrix is the sum of local matrices, ideally this
approach should work as the first one. But the solution turned out to be
garbage. Could anybody see why the second approach is wrong?
Can you be more specific what "garbage" means? Are the boundary values wrong?
The difference between your two methods is what happens to non-zero boundary
values in the rhs vector.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
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