Hello everyone! This is deal.II newsletter #204. It automatically reports recently merged features and discussions about the deal.II finite element library.
## Below you find a list of recently proposed or merged features: #13548: Fix docu of PreconditionChebyshev regarding degree (proposed by peterrum) https://github.com/dealii/dealii/pull/13548 #13547: Add RPE::all_points_found() and ::valid_point_masks() (proposed by peterrum) https://github.com/dealii/dealii/pull/13547 #13546: Add Multigrid::set_edge_in_matrix() (proposed by peterrum) https://github.com/dealii/dealii/pull/13546 #13545: Make doxygen show correct header file for GridTools::Cache (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/13545 #13543: remove notes on indentation from documentation (proposed by nfehn) https://github.com/dealii/dealii/pull/13543 #13542: Fix typo (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13542 #13541: Add ScalarType as template parameter to MeshWorker::CopyData (proposed by jppelteret) https://github.com/dealii/dealii/pull/13541 #13540: Add asserts to MGTwoLevelTransfer (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13540 #13539: MGTransferGlobalCoarsening::initialize_dof_vector() skip zeroing (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13539 #13538: Fix test for nearest query for ArborXWrappers::DistributedTree (proposed by Rombur) https://github.com/dealii/dealii/pull/13538 #13537: Add type promotion to vectorization math operations (proposed by jppelteret) https://github.com/dealii/dealii/pull/13537 #13536: Nodal renumbering (proposed by drwells) https://github.com/dealii/dealii/pull/13536 #13535: Change one GitHub Workflow CI check to use C++20 (proposed by masterleinad) https://github.com/dealii/dealii/pull/13535 #13534: Fix typo in issue_template.md (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13534 #13533: MGTwoLevelTransfer: remove fine-vector specialization for DG (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13533 #13530: Introduce DEAL_II_VERSION_LTE (proposed by peterrum) https://github.com/dealii/dealii/pull/13530 #13529: Implement MGLevelObject::n_levels() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13529 #13528: Compute DoFInfo::hanging_node_constraint_masks_comp once (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13528 #13527: Reserve internal container with correct size. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/13527 #13526: Enable `sc_init` again. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/13526 #13525: Refine MGTwoLevelTransfer::enable_inplace_operations_if_possible() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13525 #13524: MatrixFree: fix typo assert message (proposed by mschreter; merged) https://github.com/dealii/dealii/pull/13524 #13523: update changelog entry (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/13523 #13521: Revert most of "Avoid implicit bool conversions" (proposed by drwells) https://github.com/dealii/dealii/pull/13521 #13520: Refactor constraint application of MGTwoLevelTransfer (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13520 #13519: Introduce internal::MatrixFreeFunctions::ConstraintInfo (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13519 #13518: Remove specialization in MGTwoLevelTransfer::interpolate() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13518 #13515: Minor updates to the constant modes documentation. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13515 #13514: Specifying material IDs on Gmsh imports (proposed by singima; merged) https://github.com/dealii/dealii/pull/13514 #13513: Test extract constant modes 04 (proposed by gfcas) https://github.com/dealii/dealii/pull/13513 #13512: Update constant_modes doc (proposed by gfcas) https://github.com/dealii/dealii/pull/13512 #13511: Removed outdated comment. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/13511 #13508: GitHub-CI: test CPP17 (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13508 #13507: Use get_communicator() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13507 #13506: Check during MF::reinit() if AffineConstraints are closed (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13506 #13505: Add AffineConstraints::is_closed() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13505 #13504: Remove a note. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13504 #13503: Fix std_cxx17::get (proposed by peterrum) https://github.com/dealii/dealii/pull/13503 #13502: boost::get -> std_cxx17::get (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/13502 #13499: Use fast hanging node algorithm for polynomial global coarsening (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13499 #13498: GC: allow to pass in external partitioner (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13498 #13497: Add std_cxx17::variant. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13497 #13496: Implement ReferenceCell::point_is_inside. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13496 #13495: Minor doc adjustments. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13495 #13494: GC: enable inplace operation for coarse side (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13494 #13493: ComputeIndexOwner: allow to use map instead of vector (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13493 #13492: Optimize broadcast for natively-supported MPI types (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13492 #13490: affine_constraints: hide another block of forward declarations (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/13490 #13489: Added `n_nonzero_elements` to PETSc `BlockSparseMatrix`. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/13489 #13488: Removing DEAL_II_MPI_CONST_CAST (proposed by pengfej; merged) https://github.com/dealii/dealii/pull/13488 #13487: Fix bugs in ComputeIndexOwner::Dictionary and CellIDTranslator (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13487 #13486: fix a test (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/13486 #13485: Annotate more code gallery source files. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13485 #13484: Extend docu of MatrixFree::initialize_dof_vector() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13484 #13483: MPI 3: minor edits (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/13483 #13481: clarify docu of MatrixFree::initialize_dof_vector() (proposed by nfehn; merged) https://github.com/dealii/dealii/pull/13481 #13479: Simplify logic in RepartitioningPolicyTools::FirstChildPolicy (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13479 #13478: Move p:d:T::has_hanging_nodes() to DistributedTriangulationBase (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13478 #13473: Provide a template variable that can be used to query whether T is a natively supported MPI type. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13473 #13472: Deal gracefully with replicating an empty array. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13472 #13471: Use a valid communicator. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13471 #13467: Run quick tests in GitHub Linux CI (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/13467 #13438: Support SUNDIALS 6.0 and later. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13438 #13409: Performance tests: add a valgrind wrapper (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/13409 #13395: Introduce a template variable mpi_type_id_for_type. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13395 #13310: Speed up evaluation of RefSpaceFEFieldFunction (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/13310 #13181: Extend MeshWorker::ScratchData to support hp (proposed by jppelteret; merged) https://github.com/dealii/dealii/pull/13181 #12617: MatrixFree: store refinement configuration once per cell (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/12617 #11871: MGLevelGlobalTransfer/MGTransferMatrixFree: allow user to init vectors (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/11871 ## And this is a list of recently opened or closed discussions: #13544: Docu shows wrong header file for GridTools::Cache (opened and closed) https://github.com/dealii/dealii/issues/13544 #13532: Shift "coding conventions" to Wiki? (opened) https://github.com/dealii/dealii/issues/13532 #13531: Why does "coding conventions" contain information on "indentation"? (opened) https://github.com/dealii/dealii/issues/13531 #13522: Compilation error with clang-5 (opened) https://github.com/dealii/dealii/issues/13522 #13517: Why does FEPointEvaluation::EvaluatorTypeTraits use Number and not Tensor<0, dim, Number>? (opened) https://github.com/dealii/dealii/issues/13517 #13516: Should functionality such as triangulation.contains_point/face/cell(point/face/cell) be implemented in deal.II? (opened) https://github.com/dealii/dealii/issues/13516 #13510: For load balancing, should cells have a "base weight" or not? (opened) https://github.com/dealii/dealii/issues/13510 #13509: doxygen: Simplex tags move functions from namespace (opened) https://github.com/dealii/dealii/issues/13509 #13501: Robustness problem with RemotePointEvaluation (opened) https://github.com/dealii/dealii/issues/13501 #13500: Rethink whether RemotePointEvaluation should live in namespace MPI (opened) https://github.com/dealii/dealii/issues/13500 #13491: `TrilinosWrappers::BlockSparseMatrix` can only be block-symmetric? (opened) https://github.com/dealii/dealii/issues/13491 #13480: Does MatrixFree::initialize_dof_vector() set vector entries to zero? (closed) https://github.com/dealii/dealii/issues/13480 #13474: Remove DEAL_II_MPI_CONST_CAST (closed) https://github.com/dealii/dealii/issues/13474 #13469: invalid communicator in tests/fullydistributed_grids/repartitioning_05.cc (closed) https://github.com/dealii/dealii/issues/13469 #13460: failure in tests/base/aligned_vector_replicate_04.cc (closed) https://github.com/dealii/dealii/issues/13460 #13447: drop MPI 2.x support (closed) https://github.com/dealii/dealii/issues/13447 #13377: Thoughts about the interface to query MPI data types? (closed) https://github.com/dealii/dealii/issues/13377 #13242: Cannot find the header files when compiling with WSL Linux distributive in VS code (closed) https://github.com/dealii/dealii/issues/13242 #13171: Extend MeshWorker::ScratchData to support hp (closed) https://github.com/dealii/dealii/issues/13171 #11955: Optimize Utilities::MPI::broadcast() (closed) https://github.com/dealii/dealii/issues/11955 A list of all major changes since the last release can be found at https://www.dealii.org/developer/doxygen/deal.II/recent_changes.html. Thanks for being part of the community! Let us know about questions, problems, bugs or just share your experience by writing to dealii@googlegroups.com, or by opening issues or pull requests at https://www.github.com/dealii/dealii. 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