Hi Kaushik,
the `p::d::SolutionTransfer` class should be able to deal with `FENothing`
elements in your example. The tricky cases are when you're coarsening a
`FENothing` element with others as Bruno already pointed out
(h-coarsening), or if you change a `FENothing` element to a different
element in the process (p-adaptation). But with your recent modification,
you avoid these cases.
I suspect that something else causes the error in your program. Could you
run a debugger on this and give us the backtrace for the exception? This
will give us more clues to figure out what goes wrong!
Best,
Marc
On Tuesday, December 8, 2020 at 7:13:29 AM UTC-7 k.d...@gmail.com wrote:
> Hi Bruno:
> Thanks for pointing that out.
> I tried to not refine FE_nothing cells by modifying the refine loop:
> (The modified test is attached).
>
> for (auto &cell : dgq_dof_handler.active_cell_iterators())
> if (cell->is_locally_owned() && cell->active_fe_index () != 0)
> {
> if (counter > ((dim == 2) ? 4 : 8))
> cell->set_coarsen_flag();
> else
> cell->set_refine_flag();
> }
>
> But this still aborts.
> Kaushik
>
> On Tue, Dec 8, 2020 at 8:36 AM Bruno Turcksin <bruno.t...@gmail.com>
> wrote:
>
>> Hi,
>>
>> Are you sure that your test makes sense? You randomly assign FE indices
>> to cells then you refine and coarsen cells. But what does it mean to
>> coarsen 4 cells together when one of them is FE_Nothing? What would you
>> expect to happen?
>>
>> Best,
>>
>> Bruno
>>
>> On Monday, December 7, 2020 at 5:54:10 PM UTC-5 k.d...@gmail.com wrote:
>>
>>> Hi all:
>>>
>>> I modified the test tests/mpi/solution_transfer_05.cc to add a
>>> FE_Nohting element to the FECollection. I also modified the other elements
>>> to FE_Q.
>>>
>>> When I run the test, it's aborting in solution transfer.
>>> Is there any limitations in using FE_Nothing with parallel solution
>>> transfer?
>>> The modified test is attached.
>>> Thank you very much.
>>> Kaushik
>>>
>>> ----
>>> An error occurred in line <1167> of file
>>> </build/deal.ii-vFp8uU/deal.ii-9.2.0/include/deal.II/lac/vector.h> in
>>> function
>>> Number&
>>> dealii::Vector<Number>::operator()(dealii::Vector<Number>::size_type) [with
>>> Number = double; dealii::Vector<Number>::size_type = unsigned int]
>>> The violated condition was:
>>> static_cast<typename ::dealii::internal::argument_type<void(
>>> typename std::common_type<decltype(i), decltype(size())>::type)>:: type>(i)
>>> < static_cast<typename ::dealii::internal::argument_type<void( typename
>>> std::common_type<decltype(i), decltype(size())>::type)>:: type>(size())
>>> Additional information:
>>> Index 0 is not in the half-open range [0,0). In the current case,
>>> this half-open range is in fact empty, suggesting that you are accessing an
>>> element of an empty collection such as a vector that has not been set to
>>> the correct size.
>>>
>>>
>>> --
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