One more question to the renumbering schemes: I called DoFRenumbering::Cuthill_McKee(dof_handler) before calling the initialize function of the direct solver.
So this isn´t really necessary when using UMFPACK because internally a different renumbering scheme is called anyway? -Simon Am Mi., 2. Juni 2021 um 17:16 Uhr schrieb Simon Wiesheier < [email protected]>: > Thanks for all your answers! > It was my lack of mathematical background regarding solving linear systems > which brought me to that question. > > -Simon > > Am Mi., 2. Juni 2021 um 17:09 Uhr schrieb Wolfgang Bangerth < > [email protected]>: > >> On 6/2/21 8:59 AM, Abbas wrote: >> > >> > 2) Node numbering plays a role. I am not sure to what extent and I am >> not sure >> > if it is something that is done automatically by direct solvers. Step-2 >> with >> > it's Cuthill_McKee >> > < >> https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2FnamespaceDoFRenumbering.html%23ab938a690bf4e2adff191fe969b0f21d3&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7Ca666a43196f746c74d5008d925d6fd84%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637582429206627171%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=FM0KPcJ7TmnahoGrINbqZBr1hL77L8tcSf9ri4DKsHI%3D&reserved=0> >> is >> >> > something you might want to have a look at . >> >> Yes, all direct solvers I know of renumber automatically. In the case of >> UMFPACK, it uses the minimum-degree renumbering internally -- i.e., there >> is >> no need to do that on the user side. >> >> Best >> W. >> >> -- >> ------------------------------------------------------------------------ >> Wolfgang Bangerth email: [email protected] >> 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 [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/dealii/d1a526af-5945-48e4-b3a8-b9ba498b84f7%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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/CAM50jEtuqJuvrWSj9gYLLXQ5zgd-%2B6bGCD2hC9u%2BBBMnmuA02g%40mail.gmail.com.
