The deal.II news page

From: hartmann Date: Wed, 26 Sep 2001 12:41:11 +0000 (+0000) Subject: Rename c-3-1.html to this file. X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8a7f0fc24015ca58f253a090f33d8538ca18ef5;p=dealii-svn.git Rename c-3-1.html to this file. git-svn-id: https://svn.dealii.org/branches/Branch-3-2@5084 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/doc/news/2001/3.1.0-vs-3.2.0.html b/deal.II/doc/news/2001/3.1.0-vs-3.2.0.html new file mode 100644 index 0000000000..53d5b78dc2 --- /dev/null +++ b/deal.II/doc/news/2001/3.1.0-vs-3.2.0.html @@ -0,0 +1,1255 @@ + + + + + + The deal.II news page + + + + + + +

Changes between versions 3.1.0 and 3.2.0

+ + +This is a quite extensive list of changes made between versions 3.1.0 +and 3.2.0 of deal.II. It is subdivided into changes +made to the three sub-libraries base, lac, and deal.II, as well as +changes to the general infrastructure, +documentation, etc. + + + + +

General

+ +

+ New: example program step-11. +
+ (WB 2001/09/17) +
+ +
+ New: example program step-10. +
+ (WB, RH 2001/09/12) +
+ +
+ New: the ./configure script now also recognizes + Compaq's cxx compiler. The library now also compiles cleanly + with this compiler. +
+ (WB 2001/07/06) +
+ +
+ Changed: The libraries are no more linked using the C++ + compilation flags, but rather using LDFLAGS. Some compilers + object to compilation flags on the linker line. +
+ (WB 2001/05/23) +
+ +
+ Changed: If in multithreaded mode, the ACE library is now + automatically added to the $(LIBS) Makefile + variable. There is no need anymore for a special clause in your + Makefile. +
+ (WB 2001/05/23) +
+ +
+ New: the ./configure script now also recognizes + the Intel ICC compiler that was released for Linux lately. The + library now also compiles cleanly with this compiler. +
+ (WB 2001/05/22) +
+ +
+ Fixed: the program that generated HTML from the example + programs was broken on some platforms for reasons beyond our + knowledge. This is now fixed. +
+ (Roger Young, WB 2001/03/22) +
+ +
+ Improved: libraries are now all in a subdirectory lib in the + deal.II home directory. It is now easy to + make this directory a link to put the libraries on a faster + disk. +
+ (GK 2001/03/14) +
+ +
+ New Design of FiniteElements + and Mappings + +
+ New: The finite element + classes have been redesigned from scratch to allow also + elements that depend on the actual cell shape, like + Raviart-Thomas, BDM or edge elements. We have implemented + continuous Lagrange elements up to degree four and discontinous + Lagrange elements up to degree 10. They can be easily extended + to higher degree. +
+ +
+ Furthermore we have totally reimplemented the mapping + between unit and real cell. In future we won't be restricted + to Q₁ mapping any more, but we will have + Q_p mappings of arbitrary degree p. Presently + implemented are mappings up to degree 10 in 2d, and degree + three in 3d. This allows to approximate curved boundaries not + only by straight lines (linear approximation) but also by + quadratic, cubic, etc approximation. The finite elements will + be able to be combined with arbitrary mappings. So in future we + can use subparametric, iso- as well as superparametric + elements. +
+ +
+ The new implementation uses a totally new structure of + communication between FEValues, the + FiniteElements and the Mappings. Despite of this, the new + structure will almost not be 'visible' to the user of + deal.II as we tried to retain the interface + to the user (mainly that of FEValues) as far as possible. +
+ +
+ Together with this new design comes a reduction of 25000(!) + lines of deal.II code. This elimination + mainly affected code that previously was machine generated + (e.g. by maple). In view of almost unchanged execution times of + applications, the faster compilation and additional + functionality constitutes a significant improvement of + deal.II. Results produced by the new code + match those of the old design up to machine precision. +
+ (RH & GK 2001/03/13) +
+ +
+ New: There is now some support to include and use routines from the + Harwell Subroutine Library. + (See the ReadMe + file for more information on installation of HSL + subroutines.) +
+ (WB 2001/01/30) +
+ +
+ New: The ./configure script now checks for the + existence of a Fortran 77 compiler, and sets its path, some + compiler flags and the libraries to be linked in when mixing + C++ and F77 in some variables in the file + common/Make.global_options (see also + this + page). +
+ (WB 2000/12/30) +
+

+ + + + +

base

+ +

+ New: Color function DataOutBase::EpsFlags::reverse_grey_scale_color_function. +
+ (WB 2001/08/24) +
+ +
+ New: Function QProjector::project_to_child + generates quadrature formulae which act on the area which a + child would occupy. +
+ (WB 2001/08/23) +
+ +
+ Changed: The examples classes in the base directory are now + moved into a namespace Functions of + their own. This improves encapsulation, but also keeps the + documentation of these functions together, as they were + previously scrambled all over the screen in the documentation + page of the base library. +
+ (WB 2001/07/18) +
+ +
+ New: classes FourierSineFunction + and FourierCosineFunction, + resembling one mode of a Fourier decomposition. Classes FourierSineSum and FourierCosineSum, resembling sums of such + modes of a Fourier decomposition. +
+ (WB 2001/07/18) +
+ +
+ New: class vector2d was introduced + in analogy to STL class vector. The + bew class provides a two-dimensional array and replaces the use + of FullMatrix in the base library. +
+ (GK 2001/05/21) +
+ +
+ Improved: JobIdentifier::operator() includes host name if + supported by the operating system +
+ (GK 2001/05/17) +
+ +
+ New: There is now a new AutoDerivativeFunction class that + automatically computes the gradient of a function by employing + numerical difference quotients. This only, if the user function + does not provide the gradient function himself. This class can + replace the Function class as base + class for user defined Function + classes. +
+ This new class can be used if the user only implements the + value function but wants to call + also the gradient functions. +
+ (RH 2001/05/15) +
+ +
+ New: The Quadrature class now has a + constructor that only accepts quadrature points and sets the + weights to invalid values. +
+ (GK 2001/04/26) +
+ +
+ New: The function Logstream::get_prefix allows access to the prefix + string used for log-files. +
+ (GK 2001/04/26) +
+ +
+ New: There is now a global function trace that computes the trace of a tensor + of rank 2. +
+ (WB 2001/04/12) +
+ +
+ New: The Threads now has a barrier + class in order to synchronise multiple threads. In + multithreaded mode, this is an alias to the ACE_Barrier class of the ACE library, if + deal.II is not configured for multithreading, then the class is + a dummy class that does nothing. +
+ (WB 2001/03/19) +
+ +
+ New: We now support the output format of the Visualization Toolkit (Vtk) from the DataOutBase class and all derived classes. +
+ (WB 2001/03/19) +
+ +
+ New: The class TensorProductPolynomials<dim> + performs the tensor product of 1d polynomials, computes its + values, its first and second derivatives. If n + polynomials are given to the constructor of this class, it + constructs n^dim tensor product + polynomials. +
+ (RH 2001/03/14) +
+ +
+ New: LagrangeEquidistant is a new + class derived from Polynomial + providing the 1d Lagrange interpolation of degree + n of n+1 equidistant support points + in [0,1]. It is implemented up to degree 10. + This class is used for the implementation of the continuous and + discontinuous Lagrange elements. +
+ (RH 2001/03/14) +
+ +
+ New: The new Polynomial class can + be used as base class for all 1d polynomials. It stores the + coefficients of the polynomial and uses the Horner scheme to + evaluate values and all derivates. +
+ (RH 2001/03/14) +
+ +
+ New: function contract for two arguments of + Tensor<1,dim> +
+ (GK 2001/03/05) +
+ +
New: Logstream::log_time_differences (bool) makes Logstream print the time since the last + log line instead of accumulated time since program start. +
+ (GK 2001/03/05) +
+ +
Fix: Logstream::pop() does not perform anything on empty + stacks. +
+ (GK 2001/03/05) +
+ +
+ Changed: Sort the quadrature points of each Quadrature<1> in ascending order. This + actually changed the order of the points of only QGauss4 and QGauss5. +
+ (Ralf Hartmann 2001/01/22) +
+ +
+ New: function contract for two arguments of + Tensor<1,dim> +
+ (GK 2001/01/15) +
+

+ + + + +

lac

+ +

+ New: Function FullMatrix::symmetrize(). +
+ (WB 2001/09/20) +
+ +
+ Improved: the stopping criterion of SolverBicgstab without computing the exact + residual is implemented +
+ (GK 2001/09/11) +
+ +
+ New: The FullMatrix class now has a + function operator*=, which simply + scales the matrix. +
+ (WB 2001/09/02) +
+ +
+ New: Function BlockSparseMatrix::el(), + just like SparseMatrix::el(). +
+ (WB 2001/08/21) +
+ +
+ New: There is now a class MatrixOut + which can be used to convert a matrix into a graphical output, + for example in order to see visually that a matrix is + diagonally dominant or not. +
+ (WB 2001/08/21) +
+ +
+ Changed: Base class Solver and all + Preconditioner classes are now + derived from Subscriptor. + Class PreconditionLACSolver now uses + smartpointers to the given solver and preconditioner + objects. You will, therefore, have to derive your own + preconditioners and solvers from Subscriptor if you want to use it with + PreconditionLACSolver. +
+ (WB 2001/08/16) +
+ +
+ New: Classes Vector and + BlockVector now have member functions + operator*= which scale the vectors + by a constant factor. These functions are aliases for the + scale member functions except that + they return a reference to themselves. +
+ (WB 2001/08/14) +
+ +
+ New: There is now a function + FullMatrix::precondition_Jacobi. The + PreconditionJacobi class is + therefore now also applicable with the full matrix class. +
+ (WB 2001/08/11) +
+ +
+ New: The Vector and + BlockVector classes can now be + initialized using a new constructor that takes two iterators + that denote a range of elements which are to be copied. +
+ (WB 2001/08/08) +
+ +
+ Changed: The SolverCG class now + saves the initial matrix vector product if the initial value of + the solution is vector is zero, as it is common practice to use + this is starting vector. +
+ (WB 2001/06/25) +
+ +
+ New: SparsityPattern::reinit no + more throws an error if the given maximal row lengths are all + zero. +
+ (WB 2001/06/25) +
+ +
+ New: Class CompressedBlockSparsityPattern + may be used as an intermediate form of the BlockSparsityPattern. +
+ (WB 2001/06/23) +
+ +
+ New: Class CompressedSparsityPattern + may be used as an intermediate form of the SparsityPattern class if memory + requirements are tight during construction of the sparsity + pattern. +
+ (WB 2001/06/22) +
+ +
+ New: There are now functions + SparsityPattern::copy_from and + SparseMatrix::copy_from + that can be used to construct sparsity patterns and matrix at + once, i.e. without setting up a sparsity pattern element by + element, possibly after using a way too large value for the + maximal row length, then calling + SparsityPattern::compress etc. +
+ (WB 2001/05/07) +
+ +
+ New: BlockIndices::block_size + returns the size of a specified block. +
+ (WB 2001/05/07) +
+ +
+ New: There is now a (private) function SparsityPattern::optimized_lower_bound + that is used as an optimized replacement for std::lower_bound for searching in the + column number arrays. It unrolls small loops and it also seems + that the compiler is able to optimized it better due to + eliminated template parameters, making it about twice as fast + as the standard implementation. In effect, it also speeds up + the SSOR preconditioner that spent about one third of its time + in that function by approximately 15 per cent. +
+ (WB 2001/04/25) +
+ +
+ New: The FilteredMatrix class is a + replacement for the MatrixTools::apply_boundary_values + function for cases where you would like to solve several times + with the same matrix, either for different right hand sides, or + for different boundary values. +
+ (WB 2001/04/27) +
+ +
+ New: There is now a function Vector::scale(Vector) + that scales each element of the vector by the corresponding + element of the argument. +
+ (WB 2001/04/23) +
+ +
Changed: Solver functions solve + return void now. If the solver has not converged within the + maximum number of iterations or encounters a breakdown, it + throws an exception of type SolverControl::NoConvergence instead of + returning a special value. +
+ (GK 2001/03/29) +
+ +
+ New: The functions FullMatrix::mmult and Tmmult now have an additional + adding argument. If this flag is + true, the matrix-matrix product is added to the + resulting matrix; if false, the resulting matrix + is set to (overwritten by) the matrix-matrix product. The + latter is the behaviour these functions had before. Hence the + default value is set to be false to ensure + backward compatibility. +
+ (RH 2001/03/29) +
+ +
+ New: class SchurMatrix implements + a Schur complement for block matrices. It provides matrix-vector + multiplication suitable for iterative methods as well as pre- and + post-processing of right hand side and slution, respectively. +
+ (GK 2001/03/22) +
+ +
+ Removed: The explicite instantiations of SparseMatrix<long double> are + removed as a prerelease of gcc3.0 fails to compile it. A user + of SparseMatrix<long double> + needs now to include + lac/include/lac/sparse_matrix.templates.h into his + source file and to use an appropriate compiler, e.g. gcc2.95.2 or + a future version of gcc3.0 (that will then hopefully be fixed). +
+ (RH 2001/03/14) +
+ +
+ New: class BlockMatrixArray<MATRIX> implements + a block matrix based on an array of matrix pointers. Since this + array may be incomplete, no direct access to entries is + allowed. Matrix blocks may be scaled and transposed. +
+ (GK 2001/02/13) +
+ +
+ New: There is now some support to include and use routines from the + Harwell Subroutine Library, and support + classes + SparseDirectMA27 and + SparseDirectMA47 + for the sparse direct solvers MA27 and MA47. + (See the ReadMe + file for more information on installation of HSL + subroutines.) +
+ (WB 2001/01/30) +
+

+ + + + +

deal.II

+ +

+ New: Class MappingQ1Eulerian + implementing an Eulerian mapping. +
+ (Michael Stadler 2001/09/24) +
+ +
+ New: VectorTools::create_boundary_right_hand_side + integrates boundary forces for inhomogeneous Neumann boundary values. +
+ (WB 2001/09/13) +
+ +
+ New: DoFTools::make_flux_sparsity_pattern + now exists also for 1d. +
+ (WB 2001/09/03) +
+ +
+ New: There are now two functions + FETools::hierarchic_to_lexicographic_numbering + and FETools::lexicographic_to_hierarchic_numbering + which map the hierarchical numbering used in continuous finite + element classes to a lexicographical numbering and back. +
+ (WB 2001/08/31) +
+ +
+ New: ConstraintMatrix::close + now simply returns instead of throwing an exception, if the + matrix was already closed. +
+ (WB 2001/08/30) +
+ +
+ New: Member function + ConstraintMatrix::is_identity_constrained. +
+ (WB 2001/08/29) +
+ +
+ Fixed: in a rather rare case, some work was done twice in the + KellyErrorEstimator class when in + multithread mode. This is now fixed. +
+ (WB 2001/08/24) +
+ +
+ New: There is now a class GridTools + which provides algorithms working on triangulations. At + present, it offers a function computing the diameter of a + triangulation. +
+ (WB 2001/08/16) +
+ +
+ Changed: The MatrixCreator and MatrixTools class have lost their template + arguments. Rather, the individual functions now are templated + on their own, so the compiler can pick out the correct space + dimension on its own. +
+ (WB 2001/08/15) +
+ +
+ Extended: ConstraintMatrix::merge + can now handle arguments which further constrain the present object. +
+ (WB 2001/07/30) +
+ +
+ New: Implement + DoFTools::make_sparsity_pattern, + DoFTools::make_boundary_sparsity_pattern, + and + ConstraintMatrix::condense to work on + the CompressedSparsityPattern and + CompressedBlockSparsityPattern and + classes. +
+ (WB 2001/06/22) +
+ +
+ New: FE*Values::get_quadrature + returns a reference to the quadrature formula used by a + FEValues object. +
+ (WB 2001/06/21) +
+ +
+ New: DoFTools::compute_intergrid_transfer_representation + is a function that generates a matrix representation that can + be used to transfer data from one grid to one component of the + fields on another, finer, grid. +
+ (WB 2001/05/24) +
+ +
+ Changed: the GeometryInfo class + has been reverted from a general template that calculates the + values of its member variables by recursion/induction to a set + of explicitely specialized classes. This seemed necessary since + most compilers objected to the old implementation as the + declaration of the values of the class required knowledge of + the elements of the class with one lower dimension which was, + however, only being declared at present except for 1d. Also, + allocating space for variables was difficult as that would mean + declaring specializations after their first use. The new (and + very old) implementation is entirely compatible to the previous + one. +
+ (WB 2001/05/23) +
+ +
+ Changed: the classes that denote flags to the TimeStepBase_Tria class have been move + from local classes to a namespace of their own, names + TimeStepBase_Tria_Flags. +
+ (WB 2001/05/23) +
+ +
+ Fixed: due to a bug in gcc, the compiler did not check that we + did not use the set of given boundary indicators to the + DoFTools::extract_boundary_dofs + function in 1d. That set was therefore ignored. This is now + fixed. +
+ (WB 2001/05/18) +
+ +
+ Changed: the flags which are given to the GridOut class to modify the appearance of + the output have been moved from local classes of the GridOut class to a namespace names + GridOutFlags and have lost the + trailing Flags part in their name. + This change was necessary as C++ does not allow explicit + specialization of member classes; the previous use in the + library was only accepted by GCC as an extension. +
+ (WB 2001/05/17) +
+ +
+ New: The functions DoFTools::map_dof_to_boundary_indices, + DoFTools::make_boundary_sparsity_pattern, + DoFHandler::n_boundary_dofs, + DoFHandler::max_couplings_between_boundary_dofs, + and VectorTools::project_boundary_values, + are now also implemented in 1d. +
+ (WB 2001/04/29) +
+ +
+ New: There are now functions DoFTools::map_dofs_to_support_points and + DoFTools::map_support_points_to_dofs that + generate a map between DoF indices and the support points of + these DoFs, and the other way round. +
+ (WB 2001/04/24) +
+ +
+ New: Implement the VectorTools::interpolate_boundary_values + a second time, this time taking a FunctionMap object as do all the other + functions of this type. +
+ (WB 2001/04/23) +
+ +
+ Fixed: The vertex numbers written by the GridOut::write_ucd_faces function are now also + 1-based. This, to be consistent with the vertex numbers given + by the GridOut::write_ucd function. +
+ (RH 2001/04/20) +
+ +
+ Extended: the DerivativeApproximation class now also + works in 3d, as the spectral norm of a symmetric 3x3 matrix can + now be computed. +
+ (Roger Yound 2001/04/12) +
+ +
+ Fixed: the DoFRenumbering::Cuthill_McKee function + did not work correctly when giving the reversed_numbering + flag (off-by-one indexing). This is now fixed. +
+ (Oliver Rheinbach 2001/04/12) +
+ +
+ Changed: A typedef FunctionMap was + declared in at least four places previously (in classes DoFHandler, MatrixTools, VectorTools, and KellyErrorEstimator). It is now unified in + one place and is called FunctionMap<dim>::type (it is a local + typedef in a class called FunctionMap). This type is defined in the + file dofs/function_map.h. +
+ (WB 2001/04/09) +
+ +
+ Fixed: When using Neuman boundary functions in the + KellyErrorEstimator class, it was + assumed that the function object had Function::vector_value overloaded, even + in the scalar case. We now use Function::value instead. +
+ (WB 2001/04/09) +
+ +
+ New: The various MatrixCreator::create_*_matrix functions + are now using multiple threads to do their work, if the library + is configured to use multithreading. +
+ (WB 2001/04/08) +
+ +
+ New: The following functions are extended to work + on arbitrary mappings: +
+ The static create_mass_matrix, + create_boundary_mass_matrix and + create_laplace_matrix member + functions of the class MatrixCreator, +
+ the static project and project_boundary_values member functions + of the class VectorTools, +
+ the two versions of the static estimate member functions of the class + KellyErrorEstimator, +
+ and the static approximate_gradient + and approximate_second_derivative + member functions of the class DerivativeApproximation. +
+ +
+ All these functions now take a Mapping object as additional argument. +
+ For backward compatibility there exist second versions of + each of these functions that still don't have a Mapping argument. These functions + implicitely use a mapping of the class MappingQ1. +
+ (RH 2001/04/05) +
+ +
+ Removed: Along with the redesign of the FiniteElement and the Mapping classes the FiniteElement::get_local_mass_matrix function is now + removed. This was necessary as the local mass matrix depends not only on the + considered FiniteElement but also on + the mapping between the unit to the real cell. Hence this function + cannot be a member function of a FiniteElement any more. +
+ +
+ As a consequence also the MatrixCreator::create_mass_matrix function with two + arguments is removed, as it relied on the get_local_mass_matrix function. If in + future the user wants to create a mass matrix he needs to use + one of the remaining MatrixCreator::create_mass_matrix functions that require + an appropriate Quadrature as + argument. +
+ (RH 2001/04/04) +
+ +
+ New/Fixed: Now there exists a new Triangulation::ExcMultiplySetLineInfoOfLine exception, + that is thrown if the SubCellData + that is given to Triangulation::create_triangulation, multiply includes + the line info of a specific line. Before the fix the wrong + ExcInteriorLineCantBeBoundary + exception was thrown. +
+ (RH 2001/04/03) +
+ +
+ Fixed: Missing ucd is now added to the list of + supported output formats returned by GridOut::get_output_format_names. +
+ (RH 2001/04/03) +
+ +
+ New/fixed: In some obscure corner cases, the detection logic in DataOut_DoFData::add_data_vector would + not have been able to detect whether something is a DoF data + vector or a vector of cell data, and in some equally rare cases + this would also have made a difference. This is now fixed by + adding another argument to the function telling it either to + automatically detect the vector type (default) or to assume + that it has a certain type (for these corner cases). +
+ (WB 2001/03/30) +
+ +
+ Removed: the ProblemBase class, + which has been deprecated since before the release of + deal.II 3.0, has finally been removed. The + same applies for the classes + Assembler, + Equation, + MassMatrix, and + LaplaceMatrix. +
+ (WB 2001/03/27) +
+ +
+ New: There is now a class MappingC1 + that implements a continously differentiable C¹ + mapping of the boundary by using a cubic mapping with + continuous derivatives at cell boundaries. The class presently + only implements something for 2d and 1d (where it does nothing). +
+ (WB 2001/03/27) +
+ +
+ New: The static interpolate, create_right_hand_side, interpolate_boundary_values, integrate_difference and compute_mean_value member functions of + the class VectorTools are extended + to work on arbitrary mappings. All these functions now take a + Mapping object as additional + argument. +
+ For backward compatibility there exist second versions of + each of these functions that still don't have a Mapping argument. These functions + implicitely use a mapping of the class MappingQ1. +
+ (RH 2001/03/27) +
+ +
+ New: Boundary and derived classes + now have a function get_normals_at_vertices that returns a + multiple of the normal vector to the boundary at the + vertices of a given face. This is used in the construction of + C¹ mappings of the boundary. +
+ (WB 2001/03/23) +
+ +
+ New: The new function PersistentTriangulation<dim>::restore(unsigned int) allows to restore + the triangulation step by step. +
+ New: Now there exists a function PersistentTriangulation<dim>::clear_flags to allow to re-read_flags without the need of clearing + the triangulation in advance. +
+ New: The new function PersistentTriangulation<dim>::n_refinement_steps returns the number of + refinement steps stored in refine_flags. +
+ (RH 2001/03/20) +
+ +
+ New: GridGenerator::hyper_rectangle creates + coordinate-parallel rectangles in arbitrary dimension. +
+ (GK 2001/03/16) +
+ +
+ Changed: The syntax of the FiniteElement<dim>::get_unit_support_points function is + changed; it returns a reference to the vector of points in lieu + of taking this vector as argument. The unit support points are + now computed by the constructor of the FiniteElement and not on each FiniteElement<dim>::get_unit_support_points function call as + before. +
+ (WB 2001/03/14) +
+ +
+ Removed: The function FiniteElement<dim>::get_support_points + is removed as the FiniteElement + cannot know the position of the support points by itself. This is + because the support points depend on the unit support points + (known to the FiniteElement class) + but they also depend on the mapping. + + In future the support points can be computed using a FEValues object initialized with the Mapping and a Quadrature that uses the unit support + points as quadrature points. +
+ (RH 2001/03/14) +
+ +
+ New: The class Boundary has two new + functions get_intermediate_points_on_line and get_intermediate_points_on_quad that + needs to be implemented in derived classes only if GridOut is used with MappingQ of degree p>2. +
+ (RH 2001/03/14) +
+ +
+ + New: The functions GridOut::write_gnuplot and GridOut::write_eps now take a pointer to + a Mapping object as additional + argument. This allows to write grids in 2d whereby cells with a + curved boundary are transformed by the given Mapping class. The default mapping is + MappingQ1. Note, that the grids do + not show the `original' domain with boundaries described by the + Boundary classes but the + discretized domain whose boundary cells are transformed using the + given mapping. +
+ There are also a new GnuplotFlags::n_boundary_face_points and + EpsFlags::n_boundary_face_points + variables to set the number of additional points written + to represent the curved boundary faces. +
+ (RH 2001/03/14) +
+ +
+ New: The constructor of the FEValues + and FE(Sub)FaceValues classes now + take a reference of a Mapping object + as additional argument. This is the new possibility to combine + a FiniteElement with an arbitrary + Mapping, see also New FE and Mapping Design. +
+ +
+ For backward compatibility there still exists a constructor of + FEValues without a Mapping argument that uses a MappingQ1 by default. +
+ (RH 2001/03/14) +
+ +
+ Changed: We now unconditionally include + deal.II/include/grid/tria_accessor.templates.h + (which containts some inline functions for triangulation + accessor classes) into + deal.II/include/grid/tria_accessor.h to work + around a problem with gcc3.0 which does not place a copy of + these functions into the library. Previously we only included + the file in optimized mode. +
+ (RH 2001/03/14) +
+ +
+ New: The class GridReordering::Cell has + now a copy constructor to work around a bug in a gcc3.0 + snapshot. +
+ (RH, WB 2001/03/14) +
+ +
+ Changed: when refining a hexahedron in 3d, the rules by which + the new vertices at the centers of the faces and at the center + of the cell are placed, are changed. They are changed in a way + as to minimize the distortion of the resulting cells from the + optimal shape and to make them look as much alike as possible + to generate a smoother grid. +
+ (WB 2001/03/02) +
+ +
+ Fix: the DoFTools::compute_intergrid_constraints + function took memory quadratic in the number of degrees of + freedom. This is now reduced to linear behaviour, with a + constant that depends on the number of levels by which the two + grids differ. +
+ (WB 2001/02/26) +
+ +
+ Fix: in the triangulation, the straight_boundary variable, which is a + reference, was assigned the address of a temporary object. It + is unclear how this could have worked for three years, but it + apparently did... +
+ (WB 2001/02/26) +
+ +
+ New: The DoFTools class now has + a function count_dofs_per_component + that counts the number of degrees of freedom in each of the + components of the finite element, i.e. how many degrees of + freedom there are on the global mesh for each variable (field). +
+ (WB 2001/02/22) +
+ +
+ New: The CellAccessor class now has a function + has_boundary_lines that mostly has + the same semantics that at_boundary + has, but also covers the case that a hexahedron in 3d may be at + the boundary only by one line, rather than by a whole face. In + that case, at_boundary reports + false, while has_boundary_lines + reports true. +
+ (WB 2001/02/21) +
+ +
+ New: There is now a function + ConstraintMatrix::merge that merges + the constraints represented by two constraint matrices into one + object. +
+ (WB 2001/01/31) +
+

+ +

+Last update $Date$ + + +