On 4/6/24 16:24, Mohamad Ghadban wrote:
*
*
But when I changed the first FESystem into:
*FESystem[FE_Q(1)^2-**FE_Q(1)^1**]*
it worked fine because the number of base elements in both FESystems is now
the same. My question is then, is this assertion necessary?
Julian's suggestion works, but if you have two variables that are defined
everywhere and one that is defined in only part of the domain, then what you
are suggesting (working with only three components) makes sense to me.
You've already found how to make that work without getting the assertion. As
to the question of whether the assertion is necessary: Perhaps not, but the
function in question (FESystem::compare_for_domination()) might be
substantially more complicated to implement. The way it is implemented is to
assume that the two elements you are comparing have the same number of base
elements and multiplicities, and in that case determining which element
dominates is a question of determining which base element dominates. If you
wanted to remove the assertion (patches as always welcome!) you have to break
things into smaller components and compare those for domination. Here, if you have
FESystem[FE_Q(1)^3]
and
FESystem[FE_Q(1)^2-FE_Nothing^1]
that would not be too difficult. I bet that could be done in 25 extra lines of
code (again: patches are very much welcome!) but the difficult case is you have
FESystem[FE_Q(1)^3]
and
FESystem[FESystem[FE_Q(1),FE_Q(1)]-FE_Nothing^1]
for example.
Best
Wolfgang
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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