Hello everyone! This is deal.II newsletter #226. 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: #14296: Rename FPArrayComparator -> FloatingPointComparator (proposed by peterrum) https://github.com/dealii/dealii/pull/14296 #14295: Make variable names in tensor_product_matrix.h more consistent (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14295 #14294: Remove template parameter from FPArrayComparator (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14294 #14293: Extend VectorizedArrayTrait (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14293 #14292: Windows action: archive library only if merged into master (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14292 #14291: Tensor product matrix creator (proposed by peterrum) https://github.com/dealii/dealii/pull/14291 #14290: find_neighbor_type with customizable tolerance (proposed by jh66637; merged) https://github.com/dealii/dealii/pull/14290 #14289: Add TensorProductMatrixSymmetricSumCache (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14289 #14288: TensorProductMatrixSymmetricSum: switch to pointers (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14288 #14287: Vector reductions: Unroll a loop in case of vectorization (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14287 #14286: Revise some operations in compute_index_owner_internal (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14286 #14285: Remove credits from DataOutBase (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14285 #14284: Add DataOutBase::CompressionLevel::ascii (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14284 #14283: Avoid undefined behavior warning (proposed by mschreter; merged) https://github.com/dealii/dealii/pull/14283 #14282: Avoid warning regarding unused variable (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14282 #14281: Remove unnecessary include file (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14281 #14280: Make sure not to work with possibly uninitialized variables (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14280 #14279: internal::MatrixFreeFunctions::ConstraintInfo: switch data type (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14279 #14278: PreconditionRelaxation/Chebyshev fixes (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14278 #14276: Fix high-order output for vtu in parallel (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14276 #14273: Refactor TensorProductMatrixSymmetricSum (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14273 #14272: Add support for FE_Nothin in CUDA matrix-free (proposed by Rombur; merged) https://github.com/dealii/dealii/pull/14272 #14271: PreconditionChebyshev: add specialization for A and P with ranges (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14271 #14270: Triangulation: implement global_*_cell_index_partitioner() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14270 #14258: DataOutResample for multiple components (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14258 #14183: Fix Manifold<3, 3>::normal_vector (proposed by zjiaqi2018; merged) https://github.com/dealii/dealii/pull/14183 #13677: Petsc bddc preconditioner (proposed by nabw; merged) https://github.com/dealii/dealii/pull/13677 ## And this is a list of recently opened or closed discussions: #14277: `GridOutFlags::Vtk`: add flag to enable ascii output (opened and closed) https://github.com/dealii/dealii/issues/14277 #14275: `DataOut::write_vtu_in_parallel`+ `DataOutBase::VtkFlags::write_higher_order_cells` + `dim==3`: distorted cells in Paraview (opened and closed) https://github.com/dealii/dealii/issues/14275 #14274: Triangulation distributed without p4est (opened and closed) https://github.com/dealii/dealii/issues/14274 #14263: Undefined behavior warning: `Triangulation::execute_refinement_isotropic/execute_coarsening` (closed) https://github.com/dealii/dealii/issues/14263 #14247: VectorizedArray Warning (closed) https://github.com/dealii/dealii/issues/14247 #14176: no normal flux normal vector issue with half_hyper_shell (closed) https://github.com/dealii/dealii/issues/14176 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. 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