Hello everyone! This is deal.II newsletter #252. 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: #15177: Make some variables in a few tests 'const'. (proposed by bangerth) https://github.com/dealii/dealii/pull/15177 #15176: Fix do_reinit of FEPointEvaluation for empty unit_points (proposed by bergbauer) https://github.com/dealii/dealii/pull/15176 #15175: Don't try to find deal.II quietly in the examples (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15175 #15173: Add the PETSc SNES version of step-77 as a test. (proposed by bangerth) https://github.com/dealii/dealii/pull/15173 #15172: Add a test to check KINSOL's ability to deal with recoverable errors. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15172 #15171: Let doxygen resolve a citation in step-77. (proposed by bangerth) https://github.com/dealii/dealii/pull/15171 #15170: Do not reference a deprecated function. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15170 #15169: Move a function out of line. (proposed by bangerth) https://github.com/dealii/dealii/pull/15169 #15167: Avoid empty quad in MappingInfo::reinit_cells() (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/15167 #15166: introduce distributed_compute_intersection_locations (proposed by jh66637) https://github.com/dealii/dealii/pull/15166 #15165: Introduce DistributedComputeIntersectionLocationsInternal (proposed by jh66637) https://github.com/dealii/dealii/pull/15165 #15164: Allow using Trilinos 14.0 (proposed by masterleinad) https://github.com/dealii/dealii/pull/15164 #15163: RPE::evaluate_and_process(): pack only if needed (proposed by peterrum) https://github.com/dealii/dealii/pull/15163 #15161: Update documentation about CUDA requirements (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15161 #15160: NonlinearSolverSelector class implementation (proposed by singima) https://github.com/dealii/dealii/pull/15160 #15159: pass MPI_Comm by value (proposed by tjhei) https://github.com/dealii/dealii/pull/15159 #15158: MGTwoLevelTransfer: use ConstraintInfo also for fine vectors (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15158 #15156: Refactor RPE::evaluate_and_process() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15156 #15155: Fix bug in integrate_add_tensor_product_value_and_gradient_linear() for 1d (proposed by bergbauer; merged) https://github.com/dealii/dealii/pull/15155 #15154: make it possible to fill RPE with GT::DistributedComputePointLocation... (proposed by jh66637) https://github.com/dealii/dealii/pull/15154 #15153: Format journals in bibliography. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/15153 #15152: Format authors in bibliography. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/15152 #15151: Allow MappingInfo::reinit_cells() to work on containers (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/15151 #15150: Add getter for cell_data in RPE (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/15150 #15149: Introduce `MGTwoLevelTransferBase` (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/15149 #15147: MatrixFree diagonal: Avoid repeated computations and binary search (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15147 #15146: Document how we deal with errors in call-backs. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15146 #15137: Vectorize NonMatching::MappingInfo (proposed by bergbauer; merged) https://github.com/dealii/dealii/pull/15137 #15134: Make it possible to document C++20 requirements (and do so). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15134 #15121: CMake: Test link interface again (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15121 ## And this is a list of recently opened or closed discussions: #15174: Improve error message when deal.II found but not the right version. (opened and closed) https://github.com/dealii/dealii/issues/15174 #15168: Future direction of the diffent Vector classes in deal.II (opened) https://github.com/dealii/dealii/issues/15168 #15162: MatrixFree: Unify `DoFInfo` and `ConstraintInfo` (opened) https://github.com/dealii/dealii/issues/15162 #15157: Question about patch for GINKGO cmake method (opened) https://github.com/dealii/dealii/issues/15157 #15077: vanilla Ubuntu 20.04 linker errors with OpenMPI (closed) https://github.com/dealii/dealii/issues/15077 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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