Hello everyone! This is deal.II newsletter #346. 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: #19346: Simplify vec.add(a, other) to vec += other if a==1 (proposed by kronbichler) https://github.com/dealii/dealii/pull/19346 #19344: Support for Petsc version 3.25 (proposed by zhaokun-wang) https://github.com/dealii/dealii/pull/19344 #19343: Micro-optimization of the Richardson iteration. (proposed by bangerth) https://github.com/dealii/dealii/pull/19343 #19341: Make AlignedVector::replicate_across_communicator() more able to deal with big tables. (proposed by bangerth) https://github.com/dealii/dealii/pull/19341 #19340: Fix spelling of a cmake message. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19340 #19339: Make a variable 'const'. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19339 #19338: Constrain the types a function can deal with. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19338 #19337: Implement vector copy operation on MemorySpace::Default (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/19337 #19334: PreconditionChebyshev on GPU: Single kernel call for vector updates (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/19334 #19333: Reduce run time of two tests by using FE_RaviartThomasNodal (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/19333 #19332: Reduce run time of a test by reducing sizes (proposed by kronbichler) https://github.com/dealii/dealii/pull/19332 #19331: Reduce run time of a test (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/19331 #19330: Reduce run time of fe/fe*_divergence_theorem tests (proposed by kronbichler) https://github.com/dealii/dealii/pull/19330 #19329: Use unpreconditioned norm in petsc ksp (proposed by Stuwon) https://github.com/dealii/dealii/pull/19329 #19328: Fix memory leak in NonMatching::MappingInfo (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/19328 #19327: Optimize InterpolatedUniformGridData delta_x (Fix #19303) (proposed by HarshaMatta; merged) https://github.com/dealii/dealii/pull/19327 #19326: `IndexSet::n_elements()`: move the check to `compress()`. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/19326 #19325: extend usage of `children_per_object` and `ReferenceCells::max_n_children`. (proposed by AndSte01; merged) https://github.com/dealii/dealii/pull/19325 #19324: TriaAccessor: refactor how we represent the level. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/19324 #19322: TriaLevel: re-add template arguments. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/19322 #19317: Tpetra: Fix const correctness for MueLu preconditioner (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19317 #19316: VTKWrappers utilities -- part IX -- vtkUnstructuredGrid <-> Triangulation (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/19316 #19315: VTKWrappers utilities -- part VIII -- read_vtk (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/19315 #19061: Map DoFs to support points for systems with components lacking support points (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/19061 ## And this is a list of recently opened or closed discussions: #19345: SolverFIRE uses A.residual(). (opened) https://github.com/dealii/dealii/issues/19345 #19342: Triangulation::n_global_active_cells() depends on the number of processes. (opened) https://github.com/dealii/dealii/issues/19342 #19336: internal face problem with gmsh files (opened) https://github.com/dealii/dealii/issues/19336 #19335: Further investigate the odd `IndexSet`s created in #19326 (opened) https://github.com/dealii/dealii/issues/19335 #19323: Regression tester regressed eb03c6 (opened and closed) https://github.com/dealii/dealii/issues/19323 #19320: Regression tester regressed fbb404 (closed) https://github.com/dealii/dealii/issues/19320 #19307: Regression tester regressed 3663c4 (closed) https://github.com/dealii/dealii/issues/19307 #19303: InterpolatedUniformGridData::value() should not have to recompute delta_x every time. (closed) https://github.com/dealii/dealii/issues/19303 #19298: Regression tester regressed 57ad93 (closed) https://github.com/dealii/dealii/issues/19298 #19203: Regression tester regressed 4b2f91 (closed) https://github.com/dealii/dealii/issues/19203 #19110: Regression tester regressed 11d828 (closed) https://github.com/dealii/dealii/issues/19110 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 [email protected], or by opening issues or pull requests at https://www.github.com/dealii/dealii. 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