I find the problem, that FEValuesBase is not an accessor of Subscriptor in 9.3.0, while is in 9.4.0. So it's deal.II version making this error.
在2022年10月8日星期六 UTC+8 21:40:01<yy.wayne> 写道： > I modify step-75 into a matrix-based, basiclly combining the hpbox repo in > github. I came across a error while building: > > /home/ubuntu/Desktop/my_projects/step-75-matrixbased/source/step-75-mb.cc:710: > > error: ‘class dealii::hp::FEValues<2, 2>’ has no member named ‘unsubscribe’ > In file included from > /home/ubuntu/deal.II/installed/include/deal.II/distributed/tria.h:22, > from > /home/ubuntu/deal.II/installed/include/deal.II/distributed/grid_refinement.h:24, > from > /home/ubuntu/Desktop/my_projects/step-75-matrixbased/source/step-75-mb.cc:34: > /home/ubuntu/deal.II/installed/include/deal.II/base/smartpointer.h: In > instantiation of ‘dealii::SmartPointer<T, P>::~SmartPointer() [with T = > dealii::hp::FEValues<2, 2>; P = void]’: > /home/ubuntu/Desktop/my_projects/step-75-matrixbased/source/step-75-mb.cc:220:9: > > required from ‘void std::default_delete<_Tp>::operator()(_Tp*) const > [with _Tp = Step75::MatrixBasedOperator<2, double>]’ > /usr/include/c++/9/bits/unique_ptr.h:292:17: required from > ‘std::unique_ptr<_Tp, _Dp>::~unique_ptr() [with _Tp = > Step75::MatrixBasedOperator<2, double>; _Dp = > std::default_delete<Step75::MatrixBasedOperator<2, double> >]’ > /home/ubuntu/Desktop/my_projects/step-75-matrixbased/source/step-75-mb.cc:710:9: > > required from here > /home/ubuntu/deal.II/installed/include/deal.II/base/smartpointer.h:277:8: > error: ‘class dealii::hp::FEValues<2, 2>’ has no member named ‘unsubscribe’ > 277 | t->unsubscribe(&pointed_to_object_is_alive, id); > | ~~~^~~~~~~~~~~ > > I cannot figure out why this is wrong since it's same as hpbox. Could this > be due to different version (mine is 9.3.0)? > 在2022年10月7日星期五 UTC+8 13:45:41<[email protected]> 写道： > >> Yes. >> >> Peter >> On 07.10.22 07:44, 'yy.wayne' via deal.II User Group wrote: >> >> I see. So that's why we create a new dof_handlers in solve_with_gmg() >> function instead of continue using dof_handler as other tutorials. If I >> want to build mg_matrices and their SparsityPattern, they should based on >> dof_handlers as well, is it correct? >> >> Thank you >> >> 在2022年10月7日星期五 UTC+8 13:35:16<[email protected]> 写道： >> >>> Hej, >>> >>> > One thing I'm confused is that why we use >>> "make_hanging_node_constraints" and "interpolate_boundary_values" for a new >>> constraints in solve_with_gmg in step-75, instead of the >>> boundary_constraints as done in previous MG tutorials. >>> >>> Your observation is correct. It is related to the fact that p-multigrid >>> in deal.II uses the new global-coarsening infrastructure (it was introduced >>> in release 7.3). In the other tutorials, the local-smoothing infrastructure >>> is used. >>> >>> In a nutshell, the difference is that local smoothing is working on >>> refinement levels, while global coarsening works on the complete active >>> levels of multiple Triangulation/DoFHandler objects. In the case of >>> h-multigrid, one works on multiple meshes, which are created by globally >>> coarsening the finest mesh (this is the reason for the name "global >>> coarsening"); in the case of p-multigrid, one would work with the same >>> Triangulation but would distribute different FEs on different DoFHandler >>> objects. Since you work on the active level, you can simple use the >>> functions you would use if you don't work on refinement levels. >>> >>> For more details see our publication: https://arxiv.org/abs/2203.12292 >>> >>> Hope this help, >>> Peter >>> >>> On Wednesday, 5 October 2022 at 14:17:03 UTC+2 yy.wayne wrote: >>> >>>> Hello sir, >>>> >>>> One thing I'm confused is that why we use >>>> "make_hanging_node_constraints" and "interpolate_boundary_values" for a >>>> new >>>> constraints in solve_with_gmg in step-75, instead of the >>>> boundary_constraints as done in previous MG tutorials. >>>> >>>> 在2022年10月4日星期二 UTC+8 00:11:49<[email protected]> 写道： >>>> >>>>> Hi! >>>>> >>>>> The "Possibilities for extensions" section of step-75 gives you a few >>>>> hints on how to achieve p-multigrid preconditioning with matrix-based >>>>> methods: >>>>> >>>>> https://www.dealii.org/current/doxygen/deal.II/step_75.html#Solvewithmatrixbasedmethods >>>>> >>>>> If you look for an example implementation, the "hpbox" tool >>>>> demonstrates both matrix-based and matrix-free implementations of the >>>>> p-multigrid method. >>>>> https://zenodo.org/record/6425947 >>>>> https://github.com/marcfehling/hpbox/ >>>>> >>>>> Best, >>>>> Marc >>>>> >>>>> On Monday, October 3, 2022 at 3:39:51 AM UTC-6 yy.wayne wrote: >>>>> >>>>>> Hello, >>>>>> >>>>>> I plan to test the converge of polynomial multigrid preconditioning >>>>>> on a problem, with matrix-based framework. However, step-75 is a bit >>>>>> confusing since I cannot clearly separate classses contributed by >>>>>> matrix-free and p-multigrid. >>>>>> >>>>>> Specifically, in step-16 (with MeshWorker) and step-56 (assemble >>>>>> cell_matrix by hand) there are assemble_system() and >>>>>> assemble_multigrid(), >>>>>> while in step-75 there are solve_system() which calls solve_with_gmg and >>>>>> mg_solve. It is due to matrix-free or p-multigrid? By the way, is there >>>>>> a >>>>>> code gallery for matrix-based polynomial-multigrid ? >>>>>> >>>>>> Thanks >>>>>> >>>>> -- >> 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/55c95bd6-48b2-4dcf-9e6c-6544b85be53en%40googlegroups.com >> >> <https://groups.google.com/d/msgid/dealii/55c95bd6-48b2-4dcf-9e6c-6544b85be53en%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> -- 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. 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