On 01/21/2013 11:06 PM, Roy Stogner wrote:
>
> 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.
Yes, certainly, it depends what he's doing in the problem... I thought
not calling heterogenously_constrain_element_matrix_and_vector might be
the issue in K's case though, based on what he described, but I
shouldn't have implied that
heterogenously_constrain_element_matrix_and_vector is always relevant!
David
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