Pai,
I found two ways to constrain several dofs (as you mentioned, at least 3 dofs
in 2D) for my problem: 1. I can use the "add_line" function, and do not use
the "apply_boundary_values" function; or 2 . I can directly modify
"std::map<types::global_dof_index, double> boundary_values" and use the
"apply_boundary_values" function.
*I wonder if the above two ways are the same in dealii's internal
implemenation?*
They should have the same end result. They may lead to different matrix matrix
entries for the constrained degrees of freedom, but should have the same solution.
Furthermore, it is amazing to receive your reply! I have seen most of your
lectures on dealii on youtube. These lectures are very very helpful!
Very kind, thank you! But deal.II really is a community project -- I just
happen to be the messenger on many occasions.
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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