Hello everyone! This is deal.II newsletter #115. 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: #9726: replace n_array_elements in a few comments (proposed by tjhei) https://github.com/dealii/dealii/pull/9726 #9725: annotate deprecation of n_array_elements (proposed by tjhei) https://github.com/dealii/dealii/pull/9725 #9724: MPI: silence "avoid a deadlock" error message (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9724 #9723: Feature: assemble matrix from vmult utilizing sparsity pattern. (proposed by jodlbauer) https://github.com/dealii/dealii/pull/9723 #9721: Make external file names use our usual naming scheme. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9721 #9719: Fix MatrixFree graph (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/9719 #9718: improve robustness and usability of ParameterHandler (proposed by nfehn) https://github.com/dealii/dealii/pull/9718 #9717: Add a graph to matrix-free module (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/9717 #9716: Remove update_once/each() functions from FE_NedelecSZ. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9716 #9715: Minor additions to the documentation about higher order output. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9715 #9714: Minor edits to step-11 (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9714 #9713: tutorials: add more keywords (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9713 #9712: Fix compilation with Tpetra vector, 2nd attempt (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/9712 #9711: CI: check file encoding (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9711 #9710: SparsityTools::distribute_sparsity_pattern with compute_index_owner (proposed by kronbichler) https://github.com/dealii/dealii/pull/9710 #9709: Name alias of VectorizedArray::size() consistently (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/9709 #9708: Fix compilation with Tpetra vector (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/9708 #9707: Print a reduced parameter tree for XML and JSON (proposed by peterrum) https://github.com/dealii/dealii/pull/9707 #9706: Remove a few VectorizedArray::n_array_elements (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/9706 #9705: Introduce DEAL_II_VECTORIZATION_WIDTH_IN_BITS (proposed by kronbichler) https://github.com/dealii/dealii/pull/9705 #9701: Add a wiki link for high-order visualization (proposed by agrayver; merged) https://github.com/dealii/dealii/pull/9701 #9700: Respect the 3-empty-lines rule. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9700 #9699: Move table formatting code next to where the table is filled. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9699 #9698: Fix a typo. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9698 #9697: Simplify the code a bit. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9697 #9696: Link in step-69 on tutorial page (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/9696 #9695: Fix a few typos in step-69 (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/9695 #9694: Update step 11 with high-order mesh images (proposed by agrayver; merged) https://github.com/dealii/dealii/pull/9694 #9693: remove bundled muparser gcc 9 warning (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9693 #9692: bundled tbb warnings with gcc9 (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9692 #9691: Modularize step-20 better. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9691 #9688: Deprecate VectorizedArray::n_array_elements (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/9688 #9687: Replace the connections graph with the one from the recent paper. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/9687 #9686: base/tensor.h - small cleanups (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/9686 #9685: Disallow use of Tensor<-1> and Tensor<-2>. (proposed by bangerth) https://github.com/dealii/dealii/pull/9685 #9683: MF: No special treatment of cells close to proc interface (proposed by kronbichler) https://github.com/dealii/dealii/pull/9683 #9681: Change type of template argument width of VectorizedArray to std::size_t (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/9681 #9679: Default copy constructor for MatrixBlock (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/9679 #9678: rename _HAVE_CXX14_CONSTEXPR_CAN_CALL_NONCONSTEXPR (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9678 #9677: remove step-19 (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9677 #9676: merge_triangulations(): replace std::initializer_list by std::vector (proposed by nfehn; merged) https://github.com/dealii/dealii/pull/9676 #9675: VectorizedArrayIterator enable std::advance() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/9675 #9674: VectorizedArrayIterator enable std::distance and add operator+ (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/9674 #9673: clang 4 constexpr detection (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9673 #9670: remove references to step-19 (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9670 #9639: Enable Utilities::MPI::NoncontiguousPartitioner to handle padding (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/9639 #9530: Avoid correcting higher derivatives if mapping is Cartesian (proposed by simonsticko; merged) https://github.com/dealii/dealii/pull/9530 #9509: Explicitly call p4est's repartition functions instead of p::d::Tria::repartition(). (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/9509 #9100: Multigrid DataOut (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/9100 #8004: Compute coupling mass matrices using cutoff functions. (proposed by lwy5515; merged) https://github.com/dealii/dealii/pull/8004 ## And this is a list of recently opened or closed discussions: #9722: Time values of write_vtu seems to be incorrect? (opened) https://github.com/dealii/dealii/issues/9722 #9720: Missing pictures in step-11 (opened and closed) https://github.com/dealii/dealii/issues/9720 #9704: Inconsistent abbreviation of `VectorizedArray::size()` (opened and closed) https://github.com/dealii/dealii/issues/9704 #9703: ParameterHandler: add new print_parameters() (opened) https://github.com/dealii/dealii/issues/9703 #9702: ParameterHandler: add a .json example (opened) https://github.com/dealii/dealii/issues/9702 #9690: Move Python bindings up to the main library (opened) https://github.com/dealii/dealii/issues/9690 #9689: Group cells for data locality in matrix-free setup (opened) https://github.com/dealii/dealii/issues/9689 #9684: [Step-52] Dopri error in the results incorrect? (opened) https://github.com/dealii/dealii/issues/9684 #9682: Check Jacobian gradient before correcting higher derivatives (opened) https://github.com/dealii/dealii/issues/9682 #9680: Make VectorizedArray compatible with algorithms from std (opened) https://github.com/dealii/dealii/issues/9680 #9672: clang-4 compile issues (closed) https://github.com/dealii/dealii/issues/9672 #9535: Using 4 elements for Tensor<1,dim> (closed) https://github.com/dealii/dealii/issues/9535 #9455: [Step-20] Repetition of code for assignment of problem-specific coefficients is tedious and error-prone for keeping in sync (closed) https://github.com/dealii/dealii/issues/9455 #8076: Check encoding in the CI testers (closed) https://github.com/dealii/dealii/issues/8076 #7759: Add/augment wiki entry for solver non-convergence (closed) https://github.com/dealii/dealii/issues/7759 #7021: Update tutorials about higher order VTK output (closed) https://github.com/dealii/dealii/issues/7021 #5567: simplify usage of p::d::Tria::register_data_attach() and notify_ready_to_unpack() ? (closed) https://github.com/dealii/dealii/issues/5567 #2198: update_once / update_each is still in documentation (closed) https://github.com/dealii/dealii/issues/2198 #2046: Remove step-19 (closed) https://github.com/dealii/dealii/issues/2046 #1367: Allow attaching cell weights to parallel::shared::Triangulation (closed) https://github.com/dealii/dealii/issues/1367 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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