On Mon, 21 Jan 2013, David Knezevic wrote:
> 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!
And I shouldn't have implied that you didn't figure out the solution
to his problem - that's most likely exactly what he needs to fix. I
just don't want to accidentally mislead others who come across this
thread via Google later.
---
Roy
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