Hello everyone! This is deal.II newsletter #251. 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: #15151: Allow MappingInfo::reinit_cells() to work on containers (proposed by fdrmrc) https://github.com/dealii/dealii/pull/15151 #15150: Add getter for cell_data in RPE (proposed by fdrmrc) https://github.com/dealii/dealii/pull/15150 #15149: Introduce `MGTwoLevelTransferBase` (proposed by fdrmrc) https://github.com/dealii/dealii/pull/15149 #15147: MatrixFree diagonal: Avoid repeated computations and binary search (proposed by kronbichler) https://github.com/dealii/dealii/pull/15147 #15146: Document how we deal with errors in call-backs. (proposed by bangerth) https://github.com/dealii/dealii/pull/15146 #15145: Various changes to bibliography. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/15145 #15144: Clarify the documentation of a reinit() function. (proposed by bangerth) https://github.com/dealii/dealii/pull/15144 #15143: Update bibtex entries of preprints. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/15143 #15142: Convert step-57 references to bibtex, with proper cross-referencing. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15142 #15141: Add two level transfer operator between non-nested levels (proposed by fdrmrc) https://github.com/dealii/dealii/pull/15141 #15140: Auto merge scalar components of `DataOut_DoFData` into vectors and tensors (proposed by vovannikov) https://github.com/dealii/dealii/pull/15140 #15139: Add necessary include files to a code snippet in the glossary. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15139 #15138: Implement alternative rules what quadrature/mapping object to use in FEInterfaceValues::reinit(). (proposed by bangerth) https://github.com/dealii/dealii/pull/15138 #15137: Vectorize NonMatching::MappingInfo (proposed by bergbauer) https://github.com/dealii/dealii/pull/15137 #15136: Remove commented assert (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15136 #15135: MatrixFree diagonal: Avoid quadratic complexity & memory allocations (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15135 #15134: Make it possible to document C++20 requirements (and do so). (proposed by bangerth) https://github.com/dealii/dealii/pull/15134 #15133: Add changelog entry for SNES and TS (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15133 #15132: Add 'requires' clauses to PETSc solvers. (proposed by bangerth) https://github.com/dealii/dealii/pull/15132 #15131: More doxygen fixes. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15131 #15130: Added changelog for #14866. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/15130 #15129: A variety of doxygen fixes. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15129 #15128: In step-77, also talk about the other nonlinear solver packages we support. (proposed by bangerth) https://github.com/dealii/dealii/pull/15128 #15127: Sort terms so that the bilinear form has ...phi_i * phi_j ... in step-57. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15127 #15126: PETScWrappers::TimeStepper fix backward compatibility to 3.7 (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15126 #15125: Remove tabulated shape functions from MappingQ (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15125 #15124: Implement arbitrary order derivatives for tensor-product evaluators (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15124 #15122: ParameterAcceptor now uses a set. (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/15122 #15121: CMake: Test link interface again (proposed by masterleinad) https://github.com/dealii/dealii/pull/15121 #15120: Add an example to the documentation of GridTools::transform(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15120 #15119: Update PETSc compatibility stuff for SNES and TS (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15119 #15118: PETScWrappers: update KSP support (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15118 #15079: More gracefully deal with Windoze line endings. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15079 #15065: PETScWrappers: Add support for nonlinear solver (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15065 #15051: Return objects by value, rather than via a reference. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15051 #14969: Add a move assignment operator to LA::d::V. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/14969 #14866: Warn users about FE index mismatch instead of silently dropping them. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14866 ## And this is a list of recently opened or closed discussions: #15148: Multigrid for non-nested levels (opened) https://github.com/dealii/dealii/issues/15148 #15123: gcc11 O3 warnings (opened) https://github.com/dealii/dealii/issues/15123 #15111: ParameterAcceptor::clear() leads to use after free (closed) https://github.com/dealii/dealii/issues/15111 #15090: Can't compile current master with PETSc 3.7.4 (closed) https://github.com/dealii/dealii/issues/15090 #15080: Fix the spelling of Nicolson (closed) https://github.com/dealii/dealii/issues/15080 #14841: active_dof_index out of range gives no exception when FECollection has size 1 (closed) https://github.com/dealii/dealii/issues/14841 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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