CHANGELOG.md

Master (will become release 2.8)

Deprecations and removals

• Drop deprecated bindings of direct solver Pardiso.

Release 2.7

• New SolverFactory for generating sequential direct or iterative solvers and preconditioners from a ParameterTree configuration.

• BDMatrix objects now have the method solve, which implements that canonical way to solve block-diagonal linear systems.

• The class VariableBlockVector::CreateIterator is a true STL output iterator now. This means that you can use STL algorithms like std::fill or std::copy to set the block sizes.

• MultiTypeBlockVector<Args...> now inherits the constructors from its parent type (std::tuple<Args...>). This means you can now also construct MultiTypeBlockVectors from values or references of BlockVectors.

• All matrix and vector classes can now be instantiated with number types directly (A number type is any type for which Dune::IsNumber<T>::value is true). For example, you can now use BlockVector<double> instead of the more cumbersome BlockVector<FieldVector<double,1> >. Similarly, you can use BCRSMatrix<double> instead of BCRSMatrix<FieldMatrix<double,1,1>>. The old forms still work, and FieldVector and FieldMatrix types with a single entry can still be cast to their field_type. Therefore, the change is completely backward-compatible.

• Added a right-preconditioned flexible restarted GMRes solver

• The UMFPack binding use the long int functions to compute larger systems. With the *dl* versions instead of the *di* versions UMFPACK will not have a memory limit of just 2 GiB.

• Support for SuiteSparse's CHOLMOD providing a sparse Cholesky factorization.

• The interface methods dot() and norm() of ScalarProduct are now const. You will have to adjust the method signatures in your own scalar product implementations.

• MultiTypeBlockVector now implements the interface method N(), which returns the number of vector entries.

• MultiTypeBlockVector now implements the interface method dim(), which returns the number of scalar vector entries.

• MultiTypeBlockVector::count() is now const

• SeqILU can now be used with SIMD data types.

Deprecations and removals

• Deprecated support for SuperLU 4.x. It will be removed after Dune 2.7.

• Deprecated the preconditioner implementations SeqILU0 and SeqILUn. Use SeqILU instead, which implements incomplete LU decomposition of any order.

• The method setSolverCategory of OwnerOverlapCopyCommunication is deprecated and will be removed after Dune 2.7. The solver category can only be set in the constructor.

• The method getSolverCategory of OwnerOverlapCopyCommunication is deprecated and will be removed after Dune 2.7. Use category() instead.

• The method MultiTypeBlockVector::count() has been deprecated, because its name is inconsistent with the name mandated by the dune-istl vector interface.

• The method MultiTypeBlockMatrix::size() has been deprecated, because its name is inconsistent with the name mandated by the dune-istl vector interface.

Release 2.6

• BDMatrix objects can now be constructed and assigned from std::initializer_list.

• BDMatrix and BTDMatrix now implement the setSize method, which allows to resize existing matrix objects.

• The solver infrastructure was updated to support SIMD data types (see current changes in dune-common). This allows to solve multiple systems simultaniously using vectorization.