Hey all,
I am trying to solve a level set equation with DG. When I use degree=1,
everything is ok, but when I change it to degree=0, it cannot output the
results, and says:
An error occurred in line <957> of file
</home/seven/Documents/dealii-8.4.1/source/numerics/data_out_dof_data.cc>
in function
void dealii::DataOut_DoFData<DoFHandlerType, patch_dim,
patch_space_dim>::add_data_vector(const VectorType&, const
std::vector<std::basic_string<char> >&,
dealii::DataOut_DoFData<DoFHandlerType, patch_dim,
patch_space_dim>::DataVectorType, const
std::vector<dealii::DataComponentInterpretation::DataComponentInterpretation>&)
[with VectorType = dealii::Vector<double>; DoFHandlerType =
dealii::DoFHandler<2>; int patch_dim = 2; int patch_space_dim = 2]
The violated condition was:
(dofs == 0) || (triangulation->n_active_cells() != dofs->n_dofs())
The name and call sequence of the exception was:
ExcMessage("Unable to determine the type of vector automatically
because the number of DoFs " "is equal to the number of cells. Please
specify DataVectorType.")
Additional Information:
Unable to determine the type of vector automatically because the number of
DoFs is equal to the number of cells. Please specify DataVectorType.
And the following is my code:
DataOut<dim> data_out;
data_out.attach_dof_handler (dof_handler);
data_out.add_data_vector (solution, "u");
data_out.build_patches ();
std::ostringstream filename;
filename << "sol -" << timestep_number<<".vtk";
std::ofstream output (filename.str().c_str());
data_out.write_vtk (output);
What can I do to solve this problem?
Thanks,
Jiaqi
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