I took a look at your (incomplete) step-58, which (as far as I could understand) solves the equation, but without propagating it in space, just in time. I would like to propagate the result in time and accordingly in space, i.e. if the pulse propagates through a fiber, I would like to see the moving pulse. Is that possible? The matrix I was mentioning earlier would be a dense matrix, formed according to the DHT-method (i.e. no relation to FEM)
Am Dienstag, 23. Juli 2019 22:35:57 UTC+2 schrieb Wolfgang Bangerth: > > On 7/22/19 1:32 AM, 'Maxi Miller' via deal.II User Group wrote: > > More or less, yes, together with how I could get the "column" vector I > would > > like to apply the matrix to. It is not a problem to do that in a > FTDT-setting, > > but I do not know how to do that in a FEM-setting. > > When you say "column vector", you mean the vector of unknowns that > corresponds > to one column of nodes in the mesh? > Yes, basically > > One can think of deal.II Triangulations as unstructured meshes. So > extracting > a column of nodes is not a natural thing to do. But you can of course > always > loop over all nodes (e.g., using DoFTools::map_dofs_to_support_points()) > and > group them by the x-coordinate of their location. > > How you would build this matrix? That's something we can't know without > actually seeing a formula for the operator you're thinking of. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > <javascript:> > 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 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/4497b9c1-b6f9-4d51-b917-762a13004423%40googlegroups.com.
