Hello everyone! This is deal.II newsletter #320. 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: #18441: Avoid the use of anonymous namespaces in header files. (proposed by bangerth) https://github.com/dealii/dealii/pull/18441 #18440: Properly qualify a namespace name. (proposed by bangerth) https://github.com/dealii/dealii/pull/18440 #18439: Include necessary header file. (proposed by bangerth) https://github.com/dealii/dealii/pull/18439 #18438: Prefer std::free() over ::free(). (proposed by bangerth) https://github.com/dealii/dealii/pull/18438 #18437: Fix missing assertion for undefined parameters in JSON input parsing (proposed by mschreter) https://github.com/dealii/dealii/pull/18437 #18436: Provide forward declarations. (proposed by bangerth) https://github.com/dealii/dealii/pull/18436 #18435: Better document the difference between GMRES and FGMRES. (proposed by bangerth) https://github.com/dealii/dealii/pull/18435 #18434: Add utility to detect unwanted merges in feature (proposed by jpthiele) https://github.com/dealii/dealii/pull/18434 #18433: Auto-indent Python in pre-commit (proposed by jpthiele) https://github.com/dealii/dealii/pull/18433 #18432: Auto-indent Python files. (proposed by bangerth) https://github.com/dealii/dealii/pull/18432 #18431: Convert two scripts to Python 3 and indent Python scripts. (proposed by bangerth) https://github.com/dealii/dealii/pull/18431 #18430: Include a necessary header. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18430 #18429: Refactor `GridGenerator::convert_hypercube_to_simplex_mesh()`. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/18429 #18428: Let KINSOL throw an exception if it fails. (proposed by bangerth) https://github.com/dealii/dealii/pull/18428 #18427: Prefer std::ptrdiff_t over ::ptrdiff_t. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18427 #18426: Avoid the use of anonymous namespaces in header files. (proposed by bangerth) https://github.com/dealii/dealii/pull/18426 #18425: Move a block of include statements to the top of the file. (proposed by bangerth) https://github.com/dealii/dealii/pull/18425 #18424: CMake: collect all source and header files (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/18424 #18423: Create a list of all header files. (proposed by bangerth) https://github.com/dealii/dealii/pull/18423 #18422: Enable FEInterfaceValues for mixed-meshes (proposed by dominiktassilostill) https://github.com/dealii/dealii/pull/18422 #18421: Avoid a warning about an unused function argument. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18421 #18420: Add necessary include. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18420 #18418: Implementation of Portable::FEEvaluation::get/submit_symmetric_gradient (proposed by YiminJin) https://github.com/dealii/dealii/pull/18418 #18417: Read POINT_DATA from .vtk files (proposed by fdrmrc) https://github.com/dealii/dealii/pull/18417 #18416: Fix some broken links. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18416 #18415: Add necessary include file. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18415 #18414: Actually update TaskFlow to 3.10. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18414 #18413: Renumber lexicographic (proposed by mwichro) https://github.com/dealii/dealii/pull/18413 #18412: Fix some misspellings of Trilinos names. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18412 #18411: Improve error message when trying to configure with ArborX 2.0 (proposed by Rombur; merged) https://github.com/dealii/dealii/pull/18411 #18410: Be more precise with which files we compile. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18410 #18409: Add necessary header include. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18409 #18408: Fix missing copy of nonlocal_vector in `TpetraWrappers::Vector` assignment operator (proposed by QY-Shi) https://github.com/dealii/dealii/pull/18408 #18407: Enable subface quadratures for triangles (proposed by dominiktassilostill; merged) https://github.com/dealii/dealii/pull/18407 #18406: Support for matrix-free multiplicative patch smoothers. (proposed by mwichro) https://github.com/dealii/dealii/pull/18406 #18405: [WIP] Support for matrix-free multiplicative patch smoothers. (proposed by mwichro) https://github.com/dealii/dealii/pull/18405 #18404: Add a KINSOL test. (proposed by bangerth) https://github.com/dealii/dealii/pull/18404 #18403: Add some thoughts to step-93. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18403 #18402: Do not separately check for MPI 3+. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18402 #18401: Let files that use MPI include the necessary headers. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18401 #18399: Add template in Utilities::MPI::compute_set_union (proposed by brunaccampos) https://github.com/dealii/dealii/pull/18399 #18398: Add non-standard oriented quadrature on subfaces (proposed by dominiktassilostill; merged) https://github.com/dealii/dealii/pull/18398 #18397: TimeStepping: add fifth- and sixth-order RK (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/18397 #18396: Use higher order MappingQ in MappingQEulerian (proposed by gassmoeller; merged) https://github.com/dealii/dealii/pull/18396 #18395: Fix the name of an exception class reference. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18395 #18393: Fix: explicitly instantiate tpetra wrapper's BlockSparseMatrix::reinit) (proposed by QY-Shi; merged) https://github.com/dealii/dealii/pull/18393 #18392: Expand the implementation of periodicity in `FE_SimplexP`. (proposed by drwells) https://github.com/dealii/dealii/pull/18392 #18391: Cleanup `set_periodicity_constraints()` (proposed by drwells; merged) https://github.com/dealii/dealii/pull/18391 #18390: Fix FETools::extrapolate (#18389) (proposed by warthan07) https://github.com/dealii/dealii/pull/18390 #18388: Remove `P4EST_WITH_SEARCH_LOCAL`. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/18388 #18387: Fix an include statement. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18387 #18386: Un-guard two p4est declarations. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18386 #18385: Step 81: fix typos and fix logic for enabling/disabling absorbing boundary conditions. (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/18385 #18382: Add assertion to check vector compression in AffineConstraints::distribute() (proposed by kinnewig; merged) https://github.com/dealii/dealii/pull/18382 #18381: FEPointEvaluation: Make DoF numbering a constructor argument (proposed by bergbauer; merged) https://github.com/dealii/dealii/pull/18381 #18379: Give the combined orientation a glossary entry. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/18379 #18378: Add some notes to step-44. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18378 #18377: Switch MatrixOut to default to sparse output. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18377 #18376: Clarify a couple of things in the introduction to step-44. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18376 #18361: Add 1D matrices to MatrixCreator (proposed by mwichro; merged) https://github.com/dealii/dealii/pull/18361 #18336: Push configuration of header subdirectories down to these subdirectories. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/18336 #18290: Implement MPGMRES - multiply preconditioned generalized minimal residual method (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/18290 #18063: Update step-90.cc (proposed by ZhouleiJoeStone; merged) https://github.com/dealii/dealii/pull/18063 #17848: Add the step-93 tutorial program (proposed by Sam0h51; merged) https://github.com/dealii/dealii/pull/17848 ## And this is a list of recently opened or closed discussions: #18419: Use 'list(APPEND ...)' when collecting header and source files. (opened) https://github.com/dealii/dealii/issues/18419 #18400: One dimensional parallel distributed triangulation not implemented? (opened and closed) https://github.com/dealii/dealii/issues/18400 #18394: Partial support for TpetraWrappers::BlockVector explicit instantiation in deal.II (opened) https://github.com/dealii/dealii/issues/18394 #18389: FETools::extrapolate can fail when using LinearAlgebra::distributed vectors and distributed triangulations (opened) https://github.com/dealii/dealii/issues/18389 #18370: Make sparse output in MatrixOut the default. (closed) https://github.com/dealii/dealii/issues/18370 #18131: Regression tester regressed [baseline] (closed) https://github.com/dealii/dealii/issues/18131 #18048: Error in step-90 with degree 2 (closed) https://github.com/dealii/dealii/issues/18048 #17983: Import TaskFlow 3.10. (closed) https://github.com/dealii/dealii/issues/17983 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! 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