Hello everyone! This is deal.II newsletter #23. 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: #6031: Don't use SynchronousIterator in step-9, 14 (proposed by bangerth) https://github.com/dealii/dealii/pull/6031 #6029: Avoid re-init'ing the same vector twice in step-14. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/6029 #6028: Make Hermite-like polynomials represent constant by (1,1,...1) (proposed by kronbichler) https://github.com/dealii/dealii/pull/6028 #6027: Minor doc update to step-35. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/6027 #6025: Fix llvm-6 clang-tidy performance findings (proposed by masterleinad) https://github.com/dealii/dealii/pull/6025 #6024: Do not use MPI_COMM_WORLD in MG Transfer (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/6024 #6023: Parallelize FETools::compute_projection_matrices() (proposed by bangerth) https://github.com/dealii/dealii/pull/6023 #6022: Provide a function that returns the version string. (proposed by bangerth) https://github.com/dealii/dealii/pull/6022 #6021: CUDA: doxygen fixes (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/6021 #6020: Improve documentation of FETools::compute_projection_matrices(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/6020 #6014: Extend Hermite-like interpolation to case degree=2 (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/6014 #6013: remove LAPACK warning about uninitialized info variable (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/6013 #6012: CUDA: fix cmake 3.10 and remove warning (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/6012 #6011: Add a .gitignore file (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/6011 #6009: Better document one place. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/6009 #6008: Better document a piece of code. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/6008 #6007: Simplify code. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/6007 #6006: create CUDA doxygen module (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/6006 #6005: Fix Vector::operator=(TrilinosWrappers::MPI::Vector) (proposed by jppelteret; merged) https://github.com/dealii/dealii/pull/6005 #6004: Avoid compiler warnings for Function::Spherical (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/6004 #6003: Allow for setting the size of the kernel instead of a threshold in RelaxationBlock (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/6003 #6002: Parameter Acceptor Proxy. (proposed by luca-heltai) https://github.com/dealii/dealii/pull/6002 #6000: Changelog entry for #5997 (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/6000 #5999: Non-matching sparsity and mass matrix. (proposed by luca-heltai) https://github.com/dealii/dealii/pull/5999 #5998: Update a couple of things on how we generate output in the example steps (proposed by bangerth) https://github.com/dealii/dealii/pull/5998 #5997: Fix up GridTools::distort_random for p::s::Triangulation (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/5997 #5996: Guard HDF5 specific ScaLAPACK implementation (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/5996 #5995: Expand on the discussion in the introduction to step-14. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5995 #5994: Avoid clashes of class names and namespace names (proposed by masterleinad) https://github.com/dealii/dealii/pull/5994 #5993: Add json parser for input files (proposed by MFraters) https://github.com/dealii/dealii/pull/5993 #5991: cmake: print vectorization level in detailed.log (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/5991 #5990: step-37: print vectorization info (proposed by tjhei) https://github.com/dealii/dealii/pull/5990 #5989: Update tbb (proposed by drwells) https://github.com/dealii/dealii/pull/5989 #5988: Merge the two places where we compute beta in step-12 into one function. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5988 #5987: Fix a wrong link in the documentation. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/5987 #5985: Avoid ambiguity of namespace internal::ConstraintMatrix and class ConstraintMatrix (proposed by masterleinad) https://github.com/dealii/dealii/pull/5985 #5984: Simplify the creation of filenames in step-12. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5984 #5983: Update some code in step-12. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5983 #5980: Provide output file for DEAL_II_WITH_ZLIB=OFF (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/5980 #5977: instantiate p::d::GridRefinement and p::d::SolutionTransfer for dim==1 (proposed by davydden; merged) https://github.com/dealii/dealii/pull/5977 #5976: make KellyErrorEstimator<1> consistent with KellyErrorEstimator<2|3> (proposed by davydden; merged) https://github.com/dealii/dealii/pull/5976 #5975: make p::d::Tria<1> similar to dim>1 (proposed by davydden; merged) https://github.com/dealii/dealii/pull/5975 #5974: instantiate Function::Spherical and auxiliary conversion functions fo... (proposed by davydden; merged) https://github.com/dealii/dealii/pull/5974 #5973: make test scalapack_10_b shorter (proposed by BenBrands; merged) https://github.com/dealii/dealii/pull/5973 #5971: Add the Mesquite mesh adaption library (proposed by jppelteret) https://github.com/dealii/dealii/pull/5971 #5970: improve consistency of dim=1 objects in the library (p::d::Tria, KellyEstimator,...) (proposed by davydden) https://github.com/dealii/dealii/pull/5970 #5969: Replace @related by @relatesalso (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/5969 #5968: Replace @relates by @relatesalso (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/5968 #5967: Minor edits to the documentation of AnisotropicPolynomials. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5967 #5966: fix more findings of modernize-use-emplace (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/5966 #5965: Fix mentioning of sum variant for Tensor (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/5965 #5964: fix initializer in tests/manifold/chart_manifold_10 (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/5964 #5963: fix compilation of kinsol wrappers with complex PETSc (proposed by davydden; merged) https://github.com/dealii/dealii/pull/5963 #5961: Remove unused typedef (proposed by drwells; merged) https://github.com/dealii/dealii/pull/5961 #5960: Use the correct size type for a column number. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/5960 #5959: Transpose table iterator (proposed by drwells) https://github.com/dealii/dealii/pull/5959 #5957: Fix undefined functions in template instantiations (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/5957 #5956: [WIP] Lapack banded matrix wrappers (proposed by drwells) https://github.com/dealii/dealii/pull/5956 #5955: Update a couple comments about linear solvers. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5955 #5954: Update a comment on ComponentMask. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5954 #5953: Remove some more SVN ID tags. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/5953 #5951: Fix minor flaw in documentation in table.h (proposed by BenBrands; merged) https://github.com/dealii/dealii/pull/5951 #5950: Remove now unnecessary #includes. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5950 #5949: Simplify some code. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5949 #5948: Inline a message text instead of going through contortions. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5948 #5947: fix bash script stylistic issues (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/5947 #5946: add contrib/utilities/run_clang_tidy.sh (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/5946 #5945: Avoid where possible to use std::ostringstream to generate filenames. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5945 #5944: Fix findings of "modernize-use-emplace" (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/5944 #5943: Fix another clang-tidy warning (proposed by masterleinad) https://github.com/dealii/dealii/pull/5943 #5942: remove some unused exceptions (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/5942 #5941: save/load state and property of ScaLAPACKMatrix (proposed by BenBrands; merged) https://github.com/dealii/dealii/pull/5941 #5940: Exception fixes and cleanup (clang-tidy) (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/5940 #5937: add more parameters to LA::distributed::BlockVector::mmult() (proposed by davydden; merged) https://github.com/dealii/dealii/pull/5937 #5927: Cuda sparse matrix (proposed by Rombur; merged) https://github.com/dealii/dealii/pull/5927 #5921: scalapack: split _06 test into four (proposed by davydden; merged) https://github.com/dealii/dealii/pull/5921 #5919: Deprecate `fixed_int_power` (proposed by drwells; merged) https://github.com/dealii/dealii/pull/5919 #5905: Use std::uint8_t as the underlying data type for CellId. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/5905 #5732: Follow-up of #5655: add mmult and Tmmult to petsc sparse matrix and petsc parallel sparse matrix (proposed by Jie-Cheng; merged) https://github.com/dealii/dealii/pull/5732 ## And this is a list of recently opened or closed discussions: #6030: code-gallery/two_phase_flow uses old-style DataPostprocessorScalar functions (opened) https://github.com/dealii/dealii/issues/6030 #6026: Don't use SynchronousIterators in step-9, step-14 (opened) https://github.com/dealii/dealii/issues/6026 #6019: How to understand output of compute_projection_matrices (opened) https://github.com/dealii/dealii/issues/6019 #6018: Support running the testsuite under valgrind (opened) https://github.com/dealii/dealii/issues/6018 #6017: Provide Utilities::dealii_version_string() (opened) https://github.com/dealii/dealii/issues/6017 #6016: Audit uses of MPI_COMM_WORLD (opened) https://github.com/dealii/dealii/issues/6016 #6015: MPI communications in p::d::BlockVector can be smarter for 1k blocks (opened) https://github.com/dealii/dealii/issues/6015 #6010: code-gallery/CMakeLists.txt produces warning (opened) https://github.com/dealii/dealii/issues/6010 #6001: Possible error in error message (opened) https://github.com/dealii/dealii/issues/6001 #5992: GridTools::distort_random() doesn't work for parallel::shared::Triangulation (opened and closed) https://github.com/dealii/dealii/issues/5992 #5986: Fix GridTools documentation (opened) https://github.com/dealii/dealii/issues/5986 #5982: In the tutorials, get rid of EPS output (opened) https://github.com/dealii/dealii/issues/5982 #5981: warnings from #5974 in Function::Spherical (opened and closed) https://github.com/dealii/dealii/issues/5981 #5979: Error message for TrilinosWrappers::PreconditionAMG::AdditionalData::output_details (opened) https://github.com/dealii/dealii/issues/5979 #5978: improve ConstraintMatrix::distribute() for multiple p::d::Vector (opened) https://github.com/dealii/dealii/issues/5978 #5972: p::d::Tria in 1D (opened) https://github.com/dealii/dealii/issues/5972 #5962: sum(Tensor, MPI_Comm) is not in Utilities::MPI (opened and closed) https://github.com/dealii/dealii/issues/5962 #5958: scalapack_10_b has strange scaling (opened and closed) https://github.com/dealii/dealii/issues/5958 #5952: Add entry for vertex_dof_index to FAQ (opened) https://github.com/dealii/dealii/issues/5952 #5647: Need PETScWrappers::MPI::SparseMatrix::mmult that is similar to TrilinosWrappers::SparseMatrix::mmult and SparseMatrix::mmult (closed) https://github.com/dealii/dealii/issues/5647 A list of all major changes since the last release can be found at https://www.dealii.org/developer/doxygen/deal.II/changes_after_8_5_0.html. 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