Hello Keith,
" 'struct dealii::TriaAccessor< 1, 2, 2>' has no member named 'get_dof_indices'
"
TriaAccessors do not have any information about degrees of freedom. You
have to use an iterator like DoFHandler<dim>::active_cell_iterator
instead of Triangulation<dim>::active_cell_iterator.
DoFTools::extract_boundary_dofs (dof_handler, component_select, selected_dofs,
boundary_indicators);
You did not set any parts of the boundary to boundary indicator 1, thus
the whole boundary has indicator 0 by default.
Best Regards,
Markus
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