On Mon, 21 Jan 2013, David Knezevic wrote:
> You have to make sure you call
> heterogenously_constrain_element_matrix_and_vector (instead of
> constrain_element_matrix_and_vector) as in introduction_ex4.
Well, wait - this is actually a little more subtle than that. Some
systems may still need to be constrained homogeneously (e.g. if you're
solving for (du := u_{n+1} - u_{n}) rather than directly for u_{n+1}
in a time step or a newton step. It depends on how you do your
solver.
---
Roy
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