Dear all,
I am trying to apply deal.II for my research. But, the segmentation fault
happens in the refine_grid() function that comes from step-26.cc tutorial
example.
The reason why I think the segmentation error occurs in this function are
as follows...
template <int dim>
void Step6<dim>::refine_grid (const unsigned int min_grid_level,
const unsigned int max_grid_level)
{
Vector<float> estimated_error_per_cell (triangulation.n_active_cells());
KellyErrorEstimator<dim>::estimate (dof_handler,
QGauss<dim-1>(Qp+1),
typename FunctionMap<dim>::type(),
solution_FSA,
estimated_error_per_cell);
GridRefinement::refine_and_coarsen_fixed_number (triangulation,
estimated_error_per_cell,
0.2, 0.1);
if(triangulation.n_levels() >max_grid_level)
for(typename Triangulation<dim>::active_cell_iterator
cell = triangulation.begin_active(max_grid_level); cell !=
triangulation.end(); ++cell)
cell->clear_refine_flag ();
std::cout<<"It must be here!!!! 1"<<std::endl;
for(typename Triangulation<dim>::active_cell_iterator
cell = triangulation.begin_active(min_grid_level); cell !=
triangulation.end(min_grid_level); ++cell)
cell->clear_coarsen_flag ();
std::cout<<"It must be here!!!! 2"<<std::endl;
SolutionTransfer<dim> solution_trans(dof_handler);
...
As you can see, in the above function, I use "std::cout<<" to check where
the segmentation error happens.
In the result, "It must be here!!!! 1" is printed before the segmentation
error happens, but ""It must be here!!!! 2" is not printed since the
segmentation erorr happens.
So, I think the segmentation error happens due to "cell->clear_coarsen_flag
();" , but I don't know why...
FYI, in the above function, I set min_grid_level=0 and max_grid_level=3.
Is there anyone who can help me...?
Thank you .
Kyusik.
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