Thanks Daniel,

I had confused the dof_index with the vertex_number. Now It works as 
expected.

Best,
Joel

On Wednesday, September 7, 2016 at 3:47:21 PM UTC+2, Daniel Arndt wrote:
>
> Joel,
>
> In GridTools::find_cells_adjacent_to_vertex(dof_handler,center_id) you 
> need to give the number of the vertex_number as center_id, not the number 
> of the degree of freedom.
> Then, you want to use 
>
> Quadrature<dim>  
> quadrature_formula(dof_handler.get_fe().get_unit_support_points());
>
> to create a Quadrature object that gives you the support points on each 
> cell.
> Finally, you can output the global dof number and their support point on 
> each cell by: 
>
> for (unsigned int j=0; j<dofs_per_cell; ++j)
>   std::cout << local_dof_indices[j] << ": "<< 
> fe_values.quadrature_point(j) << std::endl;
>
> In this ouput, you can then search for the dofs with support_point nearest 
> to the vertex you wanted to consider.
>
> Best,
> Daniel
>

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