DOLFIN

This is a simple, consistent and intuitive object-oriented API in C++ and Python.

Features:

• Automatic and efficient evaluation of finite element variational forms through FFC or SyFi
• Automatic and efficient assembly of linear systems
• General families of finite elements, including arbitrary order continuous and discontinuous Lagrange finite elements, BDM elements, RT elements, BDFM elements, Nedelec elements and Crouzeix-Raviart
• Arbitrary mixed elements as combination of basic elements, including for example Taylor-Hood
• Discontinuous Galerkin methods including jump terms, averages, and integrals over interior mesh facets
• High-performance linear algebra through uBLAS, PETSc, Trilinos and MTL4 (experimental) with simple C++ and Python wrappers
• Parallel assembly and solve
• Simplex meshes in 1D, 2D (triangles), and 3D (tetrahedra), including adaptive mesh refinement
• Multi-adaptive mcG(q)/mdG(q) and mono-adaptive cG(q)/dG(q) ODE solvers
• Support for a range of input/output formats, including DOLFIN XML, VTK, Octave, MATLAB, Diffpack, Exodus II

What is new in this release:

• This release brings a large number of cleanups and bug fixes relative to the newly released DOLFIN 1.0-beta2.

What is new in version 0.9.11:

• Change license from LGPL v2.1 to LGPL v3 or later
• Moved meshconverter to dolfin_utils
• Add support for conversion of material markers for Gmsh meshes
• Add support for point sources (class PointSource)
• Rename logging --> set_log_active
• Add parameter "clear_on_write" to TimeSeries
• Add support for input/output of nested parameter sets
• Check for dimensions in linear solvers
• Add support for automated error control for variational problems
• Add support for refinement of MeshFunctions after mesh refinement
• Change order of test and trial spaces in Form constructors

What is new in version 0.9.10:

• Add support for automated error control for variational problems.
• Add support for refinement of MeshFunctions after mesh refinement.

What is new in version 0.9.9:

• Change build system to CMake
• Add named MeshFunctions: VertexFunction, EdgeFunction, FaceFunction, FacetFunction, CellFunction
• Allow setting constant boundary conditions directly without using Constant
• Allow setting boundary conditions based on string ("x[0] == 0.0")
• Create missing directories if specified as part of file names
• Allow re-use of preconditioners for most backends
• Fixes for UMFPACK solver on some 32 bit machines
• Provide access to more Hypre preconditioners via PETSc
• Updates for SLEPc 3.1
• Improve and implement re-use of LU factorizations for all backends
• Fix bug in refinement of MeshFunctions

What is new in version 0.9.3:

• Add global parameter "ffc_representation" for form representation in FFC JIT compiler
• Make norm() function handle both vectors and functions in Python
• Speedup periodic boundary conditions and make work for mixed (vector-valued) elements
• Add possibilities to use any number numpy array when assigning matrices and vectors
• Add possibilities to use any integer numpy array for indices in matrices and vectors
• Fix for int typemaps in PyDOLFIN
• Split mult into mult and transpmult
• Filter out PETSc argument when parsing command-line parameters
• Extend comments to SWIG interface files
• Add copyright statements to SWIG interface files (not finished yet)
• Add typemaps for misc std::vector<types> in PyDOLFIN
• Remove dependencies on std_vector.i reducing SWIG wrapper code size
• Use relative %includes in dolfin.i
• Changed names on SWIG interface files dolfin_foo.i -> foo.i
• Add function interpolate() in Python interface
• Fix typmaps for uint in python 2.6
• Use TypeError instead of ValueError in typechecks in typmaps.i
• Add in/out shared_ptr<Epetra_FEFoo> typemaps for PyDOLFIN
• Fix JIT compiling in parallel
• Add a compile_extension_module function in PyDOLFIN
• Fix bug in Python vector assignment
• Add support for compressed base64 encoded VTK files (using zlib)
• Add support for base64 encoded VTK files
• Experimental support for parallel assembly and solve
• Bug fix in project() function, update to UFL syntax
• Remove disp() functions and replace by info(foo, true)
• Add fem unit test (Python)
• Clean up SystemAssembler
• Enable assemble_system through PyDOLFIN
• Add 'norm' to GenericMatrix
• Efficiency improvements in NewtonSolver
• Rename NewtonSolver::get_iteration() to NewtonSolver::iteration()
• Improvements to EpetraKrylovSolver::solve
• Add constructor Vector::Vector(const GenericVector& x)
• Remove SCons deprecation warnings
• Memory leak fix in PETScKrylovSolver
• Rename dolfin_assert -> assert and use C++ version
• Fix debug/optimise flags
• Remove AvgMeshSize, InvMeshSize, InvFacetArea from SpecialFunctions
• Rename MeshSize -> CellSize
• Rewrite parameter system with improved support for command-line parsing,
• localization of parameters (per class) and usability from Python
• Remove OutflowFacet from SpecialFunctions
• Rename interpolate(double*) --> interpolate_vertex_values(double*)
• Add Python version of Cahn-Hilliard demo
• Fix bug in assemble.py
• Permit interpolation of functions between non-matching meshes
• Remove Function::Function(std::string filename)
• Transition to new XML io
• Remove GenericSparsityPattern::sort
• Require sorted/unsorted parameter in SparsityPattern constructor
• Improve performance of SparsityPattern::insert
• Replace enums with strings for linear algebra and built-in meshes
• Allow direct access to Constant value
• Initialize entities in MeshEntity constructor automatically and check range
• Add unit tests to the memorycheck
• Add call to clean up libxml2 parser at exit
• Remove unecessary arguments in DofMap member functions
• Remove reference constructors from DofMap, FiniteElement and FunctionSpace
• Use a shared_ptr to store the mesh in DofMap objects
• Interface change for wrapper code: PoissonBilinearForm --> Poisson::BilinearForm
• Add function info_underline() for writing underlined messages
• Rename message() --> info() for "compatibility" with Python logging module
• Add elementwise multiplication in GeneriVector interface
• GenericVector interface in PyDOLFIN now support the sequence protocol
• Rename of camelCaps functions names: fooBar --> foo_bar
• Add slicing capabilities for GenericMatrix interface in PyDOLFIN (only getitem)
• Add slicing capabilities for GenericVector interface in PyDOLFIN
• Add sum to GenericVector interface