Thanks for the clarification Prof. Bangerth and Prof. Jean Paul. On Friday, May 12, 2017 at 6:16:08 PM UTC+5:30, Wolfgang Bangerth wrote: > > On 05/12/2017 02:22 AM, Jean-Paul Pelteret wrote: > > > > By Vertex, I meant the geometric quantity only. As I have used first > order > > scalar basis functions i.e FE_Q<2> fe(1) to distribute the degrees > of > > freedom by dof_handler.distribute_dofs(fe);. I expect 'n_dofs = > > n_vertices' and also the finite element nodes to be residing > directly on > > the geometric vertices. So when I use 'vertices = > > triangulation.get_vertices();' I expect the number of > elements(Points) in > > vertices array to be equal to the number of nodes(geometric > vertices) in > > my mesh. > > > > > > This is all correct. > > But only somewhat. While it is true that their *number* is the same, > vertices > are not necessarily numbered consecutively. So the largest vertex index is > not > necessarily equal to the largest dof index. And they are definitely not > numbered so that vertex_index=dof_index. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > <javascript:> > www: http://www.math.colostate.edu/~bangerth/ > >
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