Hello everyone! This is deal.II newsletter #341. 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: #19156: ROLVector: Check for ghost elements. (proposed by marcfehling) https://github.com/dealii/dealii/pull/19156 #19154: Add missing definition of `new_isotropic_child_cell_vertices()` for hexes. (proposed by AndSte01) https://github.com/dealii/dealii/pull/19154 #19153: Added back assertions to check whether the desired refinement method is viable. (proposed by AndSte01) https://github.com/dealii/dealii/pull/19153 #19151: VTKWrappers utilities -- part VII -- data_to_dealii_vector (proposed by luca-heltai) https://github.com/dealii/dealii/pull/19151 #19150: Untemplatify things that need not be templates. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19150 #19149: DataOut: Support non-contiguous distributed vectors via ReadWriteVector (proposed by mathsen) https://github.com/dealii/dealii/pull/19149 #19148: Guard fegetexcept/fedisableexcpet correctly in ArborX tests (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19148 #19147: Replace some Asserts with compile-time checks (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19147 #19146: TpetraWrappers::SparsityPattern: Fall back to DynamicSparsityPattern if n_entries_per_row is zero (proposed by masterleinad) https://github.com/dealii/dealii/pull/19146 #19145: VTK: Add missing symbols in interface module partition (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19145 #19144: Modules: Fix compiling without NOX (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19144 #19142: Fix two links to compress(). (proposed by drwells; merged) https://github.com/dealii/dealii/pull/19142 #19141: Fix compilation when both TBB and taskflow are not available. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/19141 #19140: ReferenceCell: use more constexpr. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/19140 #19139: apply_to_subranges(): special case for small or 1 thread (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/19139 #19138: Make a function in ReferenceCell constexpr so that it can be used in assertions. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19138 #19137: Simplify connectivity.h. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19137 #19134: VTKWrappers utilities -- part VI -- read_all_data and load_vtk (proposed by luca-heltai) https://github.com/dealii/dealii/pull/19134 #19133: VTKWrappers utilities -- part V -- GridTools::parallel_to_serial_vertex_indices (proposed by luca-heltai) https://github.com/dealii/dealii/pull/19133 #19132: Fixed misspelling of "refinement" and minor refactorings. (proposed by AndSte01; merged) https://github.com/dealii/dealii/pull/19132 #19130: No longer used pointers because we are no longer using polymorphism. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19130 #19128: Use `switch` statements instead of `else-if` for branching depending on refcell type in isotropic refinement. (proposed by AndSte01; merged) https://github.com/dealii/dealii/pull/19128 #19127: Fix Trilinos module with Tpetra (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19127 #19126: Fix VTK module (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19126 #19125: gh-actions: Fix merge commit detection for CI. (proposed by marcfehling) https://github.com/dealii/dealii/pull/19125 #19124: Add origin to detect merges utility (proposed by jpthiele) https://github.com/dealii/dealii/pull/19124 #19123: Use RuntimeError in convert_header_file_to_interface_module_unit.py (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19123 #19122: Do not call `update_ghost_values` in ROLVector operations. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/19122 #19121: Remove CellType* hierarchy. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19121 #19119: CMake: autopilot: print build type and target name during build (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/19119 #19118: Move VTK version macros to source (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/19118 #19117: Simplify ReferenceCell code, part 2. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19117 #19116: Simplify ReferenceCell code, part 1. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19116 #19115: Introduce ReferenceCell::face_and_line_to_cell_vertices(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19115 #19114: Better document ReferenceCell::face_to_cell_vertices(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19114 #19113: Better document ReferenceCell::face_to_cell_lines(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19113 #19109: Enable more `Taskflow`-based parallelizations in parallel.h (proposed by QY-Shi) https://github.com/dealii/dealii/pull/19109 #19108: Obtain information from ReferenceCell instead of CellType*. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19108 #19106: TrilinosWrapper: Deprecate overloads with defaulted numbers of entries per row (proposed by masterleinad) https://github.com/dealii/dealii/pull/19106 #19105: RTreeFunctionalVisitor (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/19105 #19102: Avoid invalid operations in step-42 -- and do it better anyway! (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19102 #19097: Introduce function that returns an iterator over the face indices of a certain type of a reference cell. (proposed by AndSte01; merged) https://github.com/dealii/dealii/pull/19097 #19089: Do not allow modification of vectors with ghosts. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19089 #19080: SparseDirectMUMPS and LA::distributed::Vector (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/19080 #19062: VTKWrappers utilities -- part IV -- vtk_to_finite_element (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/19062 #19026: VTKWrappers utilities -- part III -- read_vertex_data (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/19026 #16950: Handle zero contour aligning with faces in MeshClassifier. (proposed by simonsticko; merged) https://github.com/dealii/dealii/pull/16950 ## And this is a list of recently opened or closed discussions: #19155: Regression tester regressed 95ef16 (opened and closed) https://github.com/dealii/dealii/issues/19155 #19152: Regression tester regressed f05518 (opened) https://github.com/dealii/dealii/issues/19152 #19143: `MappingQEulerian` in multi grid matrix free (opened) https://github.com/dealii/dealii/issues/19143 #19136: Regression tester regressed cce24f (opened and closed) https://github.com/dealii/dealii/issues/19136 #19135: Regression tester regressed 4f0116 (opened and closed) https://github.com/dealii/dealii/issues/19135 #19131: Regression tester regressed ea81d7 (opened and closed) https://github.com/dealii/dealii/issues/19131 #19129: Performance degradation from Taskflow (opened) https://github.com/dealii/dealii/issues/19129 #19120: Regression tester regressed 07563e (opened and closed) https://github.com/dealii/dealii/issues/19120 #19112: Issue with ReferenceCell::ReferenceCell::face_to_cell_lines() for quadrilaterals. (opened and closed) https://github.com/dealii/dealii/issues/19112 #19111: Show info of debug or release mode when compiling (opened and closed) https://github.com/dealii/dealii/issues/19111 #19110: Regression tester regressed 11d828 (opened) https://github.com/dealii/dealii/issues/19110 #19107: Regression tester regressed 50a9b6 (opened and closed) https://github.com/dealii/dealii/issues/19107 #18977: Performance degradation of `WorkStream` (`Taskflow` backend) since 9.7 (closed) https://github.com/dealii/dealii/issues/18977 #16888: NonMatching::MeshClassifier: adequate treatment of face-conforming interface (closed) https://github.com/dealii/dealii/issues/16888 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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