Nice, I looked for such a function in GridTools but I forgot about DoFTools.
Bruno Le jeu. 19 janv. 2023 à 11:44, Wolfgang Bangerth <bange...@colostate.edu> a écrit : > On 1/19/23 02:43, Wasim Niyaz Munshi ce21d400 wrote: > > I am trying to extract all the nodes present on a boundary with a > > particular id. > > Would anyone be able to help me with this? > > Also, for a vector problem how do I extract a particular dof ( eg. I > > want the global dofs corresponding to the x-displacement of all the > > nodes on the top face)? > > I know one way is to use something like : > > cell->vertex_dof_index(vertex_number) > > Is there a way to skip the loop over elements and get the required info > > directly using the boundary id? > > At the end of the day, as mentioned by Bruno, everything in deal.II > always works by way of a loop over all cells and then over the faces of > that cell. > > Sometimes, there are functions that already do that for you. In your > case, this function is what you need: > > https://dealii.org/developer/doxygen/deal.II/namespaceDoFTools.html#a05eb3b759a0491c2087cf3befcc39cc4 > > Best > W. > > > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bange...@colostate.edu > www: http://www.math.colostate.edu/~bangerth/ > > -- > The deal.II project is located at http://www.dealii.org/ > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > --- > You received this message because you are subscribed to a topic in the > Google Groups "deal.II User Group" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/dealii/UTCTGSXyEpI/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > dealii+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/dealii/db7884bf-82e2-386c-9f75-9258a62a1dcf%40colostate.edu > . > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/CAGVt9eNp0BDa0B%2Bgc3FHQjecGi_HcTKqMHYzRV_k-JPrM%2BU1uw%40mail.gmail.com.
