NEWS.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.18.2] - 2024-05-02

Fixed

• Bugfix in get_face_dofs for Nedelec GenericRefFE. Since PR#1005.
• Ensure deterministic behavior for matrix assembly involving multiple domains. Since PR#1004.

[0.18.1] - 2024-04-12

Changed

• Changed the sign of the residual in TransientLinearFEOperator to align with the conventions of AffineFEOperator. Since PR#996.

Fixed

• Bugfix in restrict_to_field for BlockMultiFieldStyle. Since PR#993.

[0.18.0] - 2024-04-12

Breaking

• ODE module extensive refactor. Breaking changes! See docs and PR for details. Since PR965.
• Fixed name clash with Statistics.mean. Since PR#988.
• Deprecated SubVector in favor of Julia's view. Since PR#989.

Added

• Added some missing API methods to Assemblers and MultiField. Since PR#985.

Fixed

• Fix when evaluating \circ operator with CellState. Since PR#987.

[0.17.23] - 2024-01-28

Changed

• Changed how symbolic_loop_matrix_vector! loop works. Now it also takes account vector entries touched from matvecdata. Since PR#975.

[0.17.22] - 2024-01-12

Added

• Added get_dof_to_node and get_dof_to_comp for LagrangianDofBasis. Since PR#964.

Changed

• Changed how allocate_vector works. Now it only allocates, instead of allocating+initialising to zero. Since PR#963.

Fixed

• Fixed issue where FineToCoarseField would not work for vector-valued fields. Since PR#970.
• Fixed issue where BlockSparseMatrixAssembler would not work correctly when permuting variables. Since PR#971.

[0.17.21] - 2023-12-04

Added

• Implemented real/imag for VectorValues
• Explicit Runge-Kutta ODE Solvers. Since PR #952
• Improved the methods allocate_in_range and allocate_in_domain with support for BlockArrays and distributed arrays. Since PR#960.

Fixed

• BlockMultiFieldStyle available for TransientMultiFieldFESpaces since PR #946.
• When creating DiscreteModelPortions, some of the FaceLabeling arrays were being aliased. This caused issues when adding tags to distributed models in debug mode. Since PR #956.
• Function add_entry! was inconsistent for AbstractMatrix and AbstractSparseMatrix. Since PR#959.

[0.17.20] - 2023-10-01

Added

• Block assembly now generalised to work with AbstractBlockArrays, to include changes in GridapDistributed. Since PR 939.
• Implici-Explicit Runge-Kutta ODE solvers. Since PR #919.

Fixed

• Using Broadcasting(\circ) instead of \circ in one of the lazy_maps used to transform a coarse field into a fine field. Since PR #938.
• Better infinite norm computation in Algebra._check_convergence. Now works for any AbstractArray type, including PVector. Since PR #940.
• Updated Runge-Kutta solver. Since PR #919.

[0.17.19] - 2023-08-23

Fixed

• Reimplemented DomainStyle for CellQuadrature to fix breaking low-level Poisson tutorial. Since PR #937.

[0.17.18] - 2023-08-15

Added

• Jacobi polynomial bases. Since PR #896.
• Replaced newest vertex bisection mesh adaptation in src/Geometry/NewestVertexBisection.jl with appropriate changes to src/Adaptivity/EdgeBasedRefinement.jl. Since PR #901.
• When refining DiscreteModels, the FaceLabeling of the resulting AdaptedDiscreteModel will now correctly inhering the tags of the parent model. This has been made possible by the addition of the method get_d_to_face_to_parent_face. Since PR#886.
• Added support for mixed adaptivity (i.e coarsening and refining), as well as non-conforming adaptivity. Since PR#886.
• Added support for block assembly of FE systems. Two new types BlockMultiFieldStyle and BlockSparseMatrixAssemblers have been added. Since PR#915.

Changed

• The API of CellQuadrature has now both data and integration domain styles as keyword arguments. Old signatures are deprecated. Since PR #885.

Fixed

• ODE operators cache linear system at initial time or the time stored by the operator. Before, the linear system was cached at time t = 0.0, which cannot be done if the operator is not well-defined at t = 0.0. Since PR #891.
• Fixed the method get_normal_vector for AdaptedTriangulation. The method get_facet_normal was using default, it's now using the spetialized implementation for the underlying triangulation type. Since PR #884.
• Fixed cell_dof_ids for the case of vectorial ConstantFESpace. Since PR #888
• Fixed generation of Modal C0 bases for Julia 1.9. Since PR #918.
• Fixed some edge cases for change_domain between AdaptedTriangulations where inneficient coordinate transformations would be applied between physical and reference domains. Since PR#886.
• Fixed: Domain limits can now be of any type (notably, floats) when refining CartesianDiscreteModels. Since PR#886.

[0.17.17] - 2023-02-24

Added

• Implemented RefinementRule and AdaptivityGlue, which encode the mapping between the old and new cells in an adapted model. Since PR #838.
• Implemented AdaptedDiscreteModel and AdaptedTriangulation, representing respectively a model and triangulation produced by adapting a parent model. This types mostly wrap around DiscreteModel and Triangulation, with some added features necessary to keep track of the adaptive hierarchy. Since PR #838.
• Implemented tools to be able to transfer CellDatums back and forth between parent and child grids. These include changes to change_domain (which now takes the source Triangulation as argument) and a new type of Measure called CompositeMeasure, which allows the integration Triangulation to be different from the Triangulation of the resulting DomainContribution. To accommodate CompositeMeasure, Measure has been made abstract type and a GenericMeasure has been created to replace the old type. Since PR #838.
• For the fine-to-coarse transfer of CellFields, the new FineToCoarseField has been implemented. This new structure bundles several fields defined on the fine mesh to create a single field on the coarse mesh. To enable fast interpolation of this type of field, we have also implemented FineToCoarseReferenceFE and FineToCoarseDofBasis. Since PR #838.
• Implemented CompositeQuadrature, a quadrature for a cell that has been refined using a RefinementRule. Since PR #838.
• Implemented simple refinement strategies for Cartesian discrete models in 2&3D as well as Unstructured discrete models in 2D. The latter is implemented by red-green refinement. Since PR #838.
• Added optimization when calling unique for a CompressedArray. Since PR #838.
• Added support for changing domain between adapted triangulations in cases where the target triangulation is a view, a BoundaryTriangulation or a SkeletonTriangulation. Since PR #868.

Fixed

• Using broadcasting through in ODESolver vector operations. Since PR #860
• Fixes to array_cache(a::Table): Now does not use the zero(T,N) function, but instead creates new empty vector using the general allocator Vector{T}(undef,N). This allows Table to work with complex composite types which don't have an easy zero(T) function defined. Since PR #838.
• Added get_metadata to all the instances of ReferenceFE. This makes the abstract type more consistent, which is necessary for the new type FineToCoarseReferenceFE. Since PR #838.
• ConstantFESpace is now properly exported. Since PR #872.

[0.17.16] - 2022-12-22

Fixed

• Fixed a bug in function collect_cell_matrix_and_vector. Since PR #849

[0.17.15] - 2022-11-10

Added

• lastindex for MultiValues for consistent usage of [end] as per length. Since PR #834
• BDM (Brezzi-Douglas-Marini) ReferenceFEs in PR #823
• Implemented ConstantFESpace. This space allows, e.g., to impose the mean value of the pressure via an additional unknown/equation (a Lagrange multiplier). Since PR #836
• Methods to construct DiracDelta at generic Point(s) in the domain. Since PR #837
• some key missing lastindex and end tests belonging to PR [#834]. Since PR #837
• AbstractVector support to weights and Points of GenericQuadrature, in particular for FillArray usage. Since PR #839
• Using the above generalization of GenericQuadrature, made the weights of quadrature of DiracDelta for generic points to be a Fill vector. Since PR #839
• Optional keyword argument T to select the floating point precision for the numerical quadrature pipeline involving Measure, CellQuadrature and Quadrature functions. T defaults to Float64 when not specified, so it doesn't involve any breaking changes in public API. Since PR #840

[0.17.14] - 2022-07-29

Added

• Functionality to take gradient of functional involving integration (DomainContribution) over Skeleton faces, with respect to the degrees-of-freedom of FEFunction. The interface remains the same - gradient(f,uh). Since PR #797
• Extended the MultiField functional gradient (with respect to degrees-of-freedom of MultiFieldFEFunction) to functionals involving Skeleton integration. The interface remains the same gradient(f,xh). Since PR #799
• Functionality to take jacobian of functional involving integration (DomainContribution) over Skeleton faces (obtained from testing bilinear form with the whole set of test fe_basis), with respect to the degrees-of-freedom of FEFunction. The interface remains the same - jacobian(f,uh). Since PR #803
• A dummy tag for ForwardDiff configs being constructed in Gridap at src/Arrays/Autodiff.jl to fix issue #805. Since PR #806

Fixed

• The behavior of gradient for functionals involving operations of CellFields inside mean and jump terms of Skeleton Integration terms. Since PR #800
• The behavior of SkeletonCellFieldPair at the Boundary integration terms. Since PR #800
• push_normal for rectangular Jacobians. Since PR#809
• Nedelec FEs with triangles. Since PR #813
• Gridap.jacobian for Skeleton integration terms, in the case of general test basis where dim not same as trial basis. Since PR #815

[0.17.13] - 2022-05-31

Added

• KeyToValMap lazy map that dynamically creates a Dict with the outputs of a function over an array of inputs. Since PR #801
• MappedDiscreteModel and MappedGrid, which are geometrical models with one extra geo map in the physical space. Since PR #801
• GridWithFEMap, which has a geometrical map defined by a FE function. Since PR #801
• Vertex bisection algorithm for refinement of triangular meshes in 2D. Since PR #733
• Generalized-α method for 1st order ODEs. Since PR #781
• Implemented (generalised) ModalC0 Polynomial bases and reference FEs. Since PR #777
• Serendipity reference FEs for any dimension and order. Since PR #777

[0.17.12] - 2022-03-24

Fixed

• Bugs related with 2nd order derivatives. Since PR #769 and #771.

[0.17.11] - 2022-03-16

Fixed

• Miscellaneous bugs associated with empty meshes. Since PR #765 and #766.

[0.17.10] - 2022-03-10

Added

• Implemented addition/subtraction between a TensorValue and a SymTensorValue. Since PR #755.
• Nédélec elements on simplices (lowest order interpolation for the moment). Since PR #758.

Fixed

• Restrict to the active model the evaluation of a FE function at arbitrary points. Since PR #752.
• Renamed GridapODEs to ODEs. Since PR #756

[0.17.9] - 2022-02-28

Added

• Extra support for dual number propagation. Since PR #653
• Added ODE tools to Gridap. GridapODEs has been merged into Gridap. Sice PR#748

[0.17.8] - 2022-02-14

Added

• Support for periodic conditions in CartesianDiscreteModels built from cmin, cmax. Since PR #738.
• Function savepvd. Since PR #736.
• Support for passing nothing as the first argument of the CartesianDiscreteModel constructor to mimic the API of GridapDistributed. Since PR #735.

Fixed

• Bug in SymTensorValue. Since PR #740.
• Bug in interpolation at arbitrary points. Since PR #729.
• Bug in reference_grid(TET). Since PR #734.
• Bug in computation of Hessian with AD for multi-field. Since PR #731.

[0.17.7]- 2021-12-03

Fixed

• Improving compile times by removing unnecessary @inline statements. Since PR #726.

Added

• CellFE constructor now gets optional arguments and pass them down. Since PR #728.

[0.17.6] - 2021-12-01

Added

• Implemented Base.unaliascopy(A::SubVector). Since PR #715.

Fixed

• Bugfix in Base.view(glue::FaceToFaceGlue,ids::AbstractArray). Since PR #724.

[0.17.5] - 2021-11-08

Added

• Hiding the creation of FESolver and LinearFESolver from user code. Since PR #705.

[0.17.4] - 2021-10-27

Fixed

• Using implementation of pvtk_grid provided in WriteVTK. Since PR #699.

[0.17.3] - 2021-10-27

Fixed

• Adding a newer version of WriteVTK in the [compat] section. Since PR #698.

[0.17.2] - 2021-10-26

Fixed

• AD with multi-field residuals with different num dofs per field. Since PR #687.

[0.17.1] - 2021-10-26

Fixed

• Laplacian Δ operator on unstructured linear grids for quantities defined in the reference space (i.e. shape functions in standard FEM). Since PR #691.
• Laplacian Δ operator on triangulations using GridView (e.g., when interpolating functions in a sub-domain or on the boundary). Since PR #691.
• Fixed typo in , function solve! of LinearSolvers.jl`. Since PR #692.

[0.17.0] - 2021-10-22

Added

• Aliases Interior, Boundary, Skeleton, and Interface for the Triangulation, BoundaryTriangulation, SkeletonTriangulation, and InterfaceTriangulation constructors. Since PR #662.
• Function create_pvtk_file for exporting results in pvtu format. Since PR #685.

Changed

• Major refactoring in the Triangulation interface to properly support the solution of PDEs defined on domains of different dimension. The major change from the user perspective is that Triangulation objects can be used both to integrate the weak form (as before) but also to define FE spaces (except for unfitted triangulations obviously). It is still possible to define FE spaces from DiscreteModels, but it is safer and more idiomatic (closer to the math notation) to use Triangulation objects from now on. Since PR #662.
• Changes in assembly interface to allow optimization when assembling matrices and vectors simultaneously. Since PR #685.

Removed

• BoundaryDiscreteModel, RestrictedDiscreteMdeol, RestrictedTriangulation, TriangulationStyle, BackgroundTriangulation, SubTriangulation, get_cell_to_bgcell, get_cell_ref_map, get_background_triangulation, and have_compatible_domains. Since PR #662.
• Functions scale_entries! and fill_entries!. Replaced by Julia functions LinearAlgebra.rmul! and LinearAlgebra.fillstored!. Since PR #680.

[0.16.5] - 2021-09-08

Added

• Implemented DIV operator for FE functions in RT space. Since PR #650.
• GenericAssemblyStrategy. Since PR #655.
• Additional high level API assembly functions. Since PR #652.

Fixed

• Bug related with the release of ChainRulesCore version 1.3.1. Since #654.
• Inheritance relationship for DiscreteModelPortion. Since PR #645.
• Optimization to RT FEs. Since PR #638.
• Bug in boundary discrete model. Since PR #651.

[0.16.4] - 2021-08-17

Added

• Trait to CellQuadrature to support the evaluation of integrals on the reference domain. Since PR #636.
• Type Interpolable allowing to interpolate data from two independent meshes. Since PR #632.

[0.16.3] - 2021-06-28

Fixed

• Deactivating optimizations related with MemoArray since they are not reliable. Since PR #624.
• Bug related with ArrayBlock. Since PR #623.

[0.16.2] - 2021-06-21

Fixed

• Bug related with boundary integration caused by some optimization introduced in v0.16. Fixed via PR #616.

[0.16.1] - 2021-06-04

Fixed

• Bug for 1st order FE spaces in combination of 1st order models with periodic BCs. Since PR #611.

[0.16.0] - 2021-06-04

Added

• User API to select specific quadrature rules. Since PR #578.
• Experimental support for mixed dimensional PDEs. Since PR #567.
• Added get_cell_dof_basis(model,cell_reffes,::Conformity) and get_cell_shapefuns(model,cell_reffes,::Conformity). Since PR #579.
• Implemented get_cell_dof_basis and get_cell_shapefuns for global RT FE spaces in a new file DivConformingFESpaces.jl. Since PR #579.
• Added support to allow evaluation of FE functions at arbitrary points. Since PR #523.
• Implemented compute_cell_points_from_vector_of_points to build CellPoint from a vector of points. Since PR #523.

Changed

• Major refactoring in the handling of blocks (e.g. in multi-field and skeleton terms). The new code follows a much more simple approach based in the new type ArrayBlock. Since PR #583.
• The default quadrature rule for tets has changed. Since PR #578.
• Refactoring in SparseMatrixAssembler to make it more extensible and efficient. Since PR #568.
• Renamed get_free_values -> get_free_dof_values. Since PR #567.
• Renamed get_dirichlet_values -> get_dirichlet_dof_values. Since PR #606.
• Renamed object -> value the variable in ConstantField. Since PR #606.
• Miscellaneous changes in the FE assembly to allow the solution of mixed dimensional problems. Since PR #567.
• Renamed get_cell_shapefuns by get_fe_basis. Since PR #579.
• Renamed get_cell_shapefuns_trial by get_trial_fe_basis. Since PR #579.
• Renamed get_cell_dof_basis by get_fe_dof_basis. Since PR #579.
• Removed conformity optional keyword argument from FESpace(::DiscreteModel,::CellFE; kwargs...) constructor. Since PR #579.
• Replaced CellFE(::AbstractArray{<:Field},::AbstractArray{<:ReferenceFE}) by CellFE(::DiscreteModel,::AbstractArray{<:ReferenceFE},::Conformity). Since PR #579.

Removed

• All code associated with with BlockArrayCoo. Since PR #583.
• Module Gridap.Integration has been deleted and its contents have been merged into Gridap.ReferenceFEs module.
• Types SparseMatrixCSR and SymSparseMatrixCSR have been moved to the registered package SparseMatricesCSR. To use them simply add SparseMatricesCSR into your environment and type using SparseMatricesCSR. Since Since PR #568.
• Removed PushForwardMap and all code depending upon it. Since PR #579.

[0.15.5] - 2021-05-25

Added

• Differential operators (∇+k)(u), (∇+k)⋅u, (∇+k)×u, (∇+k)⊗u, and u⊗(∇+k) for some u::CellField and k::VectorValue. Since PR #597.
• Definition of u.*v between instances of vector-valued CellField objects u and v. Also differential operators ∇.*u and (∇+k).*u. Since PR #597.

[0.15.4] - 2021-03-29

Fixed

• Bug in CartesianDiscreteModel with periodic boundary conditions that shows up in Julia 1.6 but not in Julia 1.5. Since commit da005cf.

[0.15.3] - 2021-03-16

Added

• get_cell_map now returns array of AffineMap for linear grids of simplices. Needed to compute Laplacian operator, inverse maps etc. Since PR #553.

Fixed

• Bug in print_op_tree. Since PR #563

[0.15.2] - 2021-03-08

Added

• Method inverse_map for AffineMap. Since PR #552.
• Method get_cell_points for CellDof. Since PR #551.
• Evaluation of MonomialBasis objects at a single point. Since PR #550.
• rand function for MultiValue objects. Since PR #530.

Fixed

• Bug in return_value for Broadcasting(∇∇). Since PR #554.
• Bug in dot for third order tensors. Since PR #544.

[0.15.1] - 2021-01-22

Added

• Added support for Hessian and Laplacian operators. Only implemented for Finite Elements with an AffineMap. Since PR #514.

Fixed

• Bug in RestrictedDiscreteModel for periodic boundary conditions. Since PR #517.
• Bug in sum(a::LazyArray) when eltype(a) <: AbstractArray. Since PR #513.

[0.15.0] - 2020-12-14

This version is a major (backwards-incompatible) refactoring of the project which is not summarized here for the sake of brevity. Most of the functionality of v0.14.0 is available in v0.15.0, but possibly with a significantly different API. See here the changes in the sources of the Gridap Tutorials between versions 0.14.0 and 0.15.0 to effectively see the major changes in the API.

[0.14.2] - 2020-11-24

Added

• Added additional tensor operations and new double contraction notation ⋅². Implemented a zero constructor for ThirdOrderTensorValues to allow integration of 3-tensors. Since PR #415.

Fixed

• Bug-fix for 32-bit Julia: Replace all occurrences of Int64 by Int. Since PR #445.
• Bug-fix for 32-bit Julia. Using inttype=Int keyword argument for JSON parsing. Since PR #456.

[0.14.1] - 2020-09-17

Added

• Added VectorWithEntryInserted and VectorWithEntryRemoved. Since PR #401.
• Added missing get_constant_approach() getter to FESpaceWithConstantFixed. Since PR #409.

Deprecated

• The name FESpaceWithLastDofRemoved has been deprecated in favor of its generalization FESpaceWithConstantFixed. Since PR #396 and PR #404.

[0.14.0] - 2020-08-27

Removed

• Support for Julia v1.0. Now, the minimum supported is Julia v1.3. Since PR #376.

Changed

• Major refactoring associated with the handling of elemental matrices and vectors in multi-field computations and also on the skeleton. Since PR #376.
• First and second argument switch in update_state_variables! in order to have function-first style. Since PR #376.
• Table struct has been generalized such that data and ptrs arrays can be of an arbitrary type extending AbstractArray. Since PR #310
• interpolate, interpolate!, interpolate_dirichlet... switched argument order to function first style. For instance interpolate(u, V) instead of interpolate(V, u)

Added

• Allowing the construction of an HomogeneousTrialFESpace from a TrialFESpace. Since PR #384.
• Support for automatic differentiation of residuals and Jacobians in multi-field computations since PR #383.
• New FilterKernel since PR #379.

Fixed

• Bug associated with boundary triangulation in 1D discrete models. Since PR #393.

[0.13.4] - 2020-08-23

Added

• New FilteredCellArray since PR #372.

[0.13.3] - 2020-08-12

Added

• Visualization.visualization_data function that makes it easier to bring fields into visualization library friendly formats. Since PR #354.
• Gradient of a product binary operation (*) between a scalar and a field. Since PR #340.

[0.13.2] - 2020-07-31

Added

• Automatic differentiation of the Jacobian from a given residual and the Jacobian and the residual from a given energy. Not working at this moment on the Skeleton nor for multi-field (WIP), but yes for other cases. Now, the user can omit jac from FETerm(res,jac,trian,quad), i.e. FETerm(res,trian,quad) and the Jacobian will be automatically generated. In addition, the user can write FEEnergy(ener,trian,quad) for a given ener(uh) function and the residual and the Jacobian will be automatically generated. Since PR #338.

[0.13.1] - 2020-07-24

Fixed

• Bugs associated with the degenerated case of 0-length arrays. Since PR #331 and #332.

[0.13.0] - 2020-07-23

Added

• Automatic differentiation for symmetric gradient, i.e. ε(u) for a given vector-valued function u. Since PR #327.
• Added missing SparseMatrixAssembler constructor for MultiFieldFESpaces. Since PR #320.
• kw-argument space to LagrangianRefFE constructor in order to select the type of underlying polynomial space, i.e., :Q, :S, or :P. Since PR #321.

Changed

• The meaning of inward/outward has slightly changed for SkeletonCellBasis objects. Now, by accessing to these properties a ReducedSkeletonCellBasis is returned, which allows to use the result in a more flexible way (in particular, the result can be used in a similar way than the result of jump or mean). Since PR #317.
• Major refactoring in ReferenceFEs module. Since PR #319 and #321. In particular:
  • NodalReferenceFE has been replaced by a new abstract type LagrangianRefFE.
  • GenericNodalCartesianRefFE has been replaced by GenericLagrangianRefFE.

Removed

• Removals associated with the ReferenceFEs refactoring in PR #319:
  • Removed QDiscRefFE constructor. Use a standard LagrangianRefFE and L2Conformity instead.
  • Removed PDiscRefFE constructor. Use LagrangianRefFE constructor with the kw-argument space=:P.
  • Removed CDLagrangianRefFE constructor. Use a standard LagrangianRefFE and CDConformity instead.
  • Removed fields face_own_dofs and face_own_dof_permutations from GenericRefFE.
  • Removed struct DiscRefFE.

Fixed

• Better handling of FE terms defined on empty triangulations. Since PR #329.
• Replaced += by add_entry!. Since PR #316.
• Minor fix to let Vtk.jl support changes in Vtk 1.7.X versus 1.6.X. Since PR #324.

[0.12.0] - 2020-07-07

Added

• Added SkeletonTriangulation constructor in order to integrate, where a given interpolation is discontinuous. Since PR #304.
• New ConformingFESpace constructor. Since PR #293.
• Added QDiscRefFE constructor for DiscRefFE. Since PR #293.
• New FESpace constructor that takes an instance of ReferenceFE. Since PR #294.
• New FESpace constructor that takes an instance of Conformity. Since PR #311.
• New CDLagrangianRefFE struct, that provides a Lagrangian reference FE with different conformity per direction. Since PR #299.
• New FESpace method that takes a model and a RefFE. Since PR #299.
• Possibility to have 0 order in DISC directions of a CDLagrangianRefFE. Since PR #308.
• Added setindex! method for Reindexed. Since PR #309.

Changed

• Changed the interfaces of ReferenceFE and NodalReferenceFE in relation of DOF ownership. Now function get_face_own_dofs and related ones are parametrized by a Conformity object. Since PR #311.
• The constructors GenericRefFE, GenericNodalCartesianRefFE, and compute_conforming_cell_dofs take an extra argument of type Conformity. Since PR #311.
• Renamed PDiscRefFE -> DiscRefFE struct keeping the name for constructor. Since PR #293.
• One of the GradConformingFESpace methods now more general ConformingFESpace. Since PR #293.
• DivConformingFESpace and CurlConformingFESpace constructors eliminated. Since PR #293.
• Extend table to support arbitrary vector types. Since PR #310.

Fixed

• Construction of VectorValue, TensorValue, et al. objects from non-homogeneous arguments. This solves some problems associated with automatic differentiation. Since PR #298.
• CDLagrangianRefFE node ordering. Since PR #305.

[0.11.2] - 2020-06-22

Added

• Method solve!(x,ls,op::AffineOperator,cache::Nothing,newmatrix). Since PR #288.

Fixed

• Bug related with WriteVTK version 1.7. Fixed via PR #287.
• Bug in outer constructor of Table{...} for input arrays of abstract type. Fixed via PR #285.

[0.11.1] - 2020-06-19

Fixed

• Bug in the handling of caches in NLSolver. Fixed via PR #283.
• Bug that showed up when interpolating a FE function defined on an ExtendedFESpace onto a non-extended FESpace. Fixed via PR #282.

[0.11.0] - 2020-06-16

Added

• Operator ⊙ (\odot) as an alias of inner. Since PR #239.
• Operator ⊗ (\otimes) as an alias of outer. Since PR #239.
• Support for (symmetric) 4th order tensors. Since PR #239.
• Optimizations for symmetric 2nd order tensors. Since PR #239.
• Methods for cross function (aka × (\times)) to operate with VectorValues. Since PR #280.
• Interpolation is now supported also for multifield spaces. Since PR #279.

Changed

• Major refactoring in the module Gridap.TensorValues. Since PR #239. The following changes are likely to affect all users:
  • The operator * is not allowed for expressing the dot product anymore. Use LinearAlgebra.dot function aka ⋅ (\cdot).
  • The syntax ∇*u is not allowed anymore. Use ∇⋅u instead.
  • Gridap re-exports dot, ⋅, and other names from LinearAlgebra that are used often in Gridap code.
  • Function n_components is renamed to num_components.
• The SingleFieldFESpace interface has changed. The function gather_free_and_dirichlet_values! has been added as mandatory for all FE space implementations and the old function gather_free_and_dirichlet_values is now optional. Since PR #279.

[0.10.4] - 2020-06-8

Added

• Functions create_vtk_file and createvtk. Since PR #273.

[0.10.3] - 2020-05-29

Added

• Function print_op_tree to visualize lazy operation trees. Since PR #270.
• Exported apply and reindex from Gridap top level. Since PR #270.
• Extended support of CartesianDiscreteModel to models with periodic boundary conditions. PR #266.

Deprecated

• Optional argument map for CartesianDescriptor converted to a key-word argument. Since PR #266.

Fixed

• Fixed some methods of the sparsecsr generic function. Since PR #262.
• Fixed BUG in findnz function for SparseMatrixCSR. Since PR #264.
• Fixed restrict(::AbstractArray,::TriangulationPortion) for portions of triangulations extending BoundaryTriangulation. Since PR #267.

[0.10.2] - 2020-05-21

Added

• New key-word arguments zeromean_trian and zeromean_quad in the FESpace constructor. Since PR #257.
• New method reindex(::Triangulation,indices). Since PR #257.
• New functions get_face_to_face(::BoundaryTriangulation) and get_cell_around(::BoundaryTriangulation). Since PR #256.

[0.10.1] - 2020-05-19

Fixed

• Added missing implementation of simplexify(SEGMENT) and simplexify(VERTEX). Since PR #252.

[0.10.0] - 2020-05-14

Added

• Extended support of TriangulationPortion to boundary and skeleton triangulations. Since PR #249.
• Added FESpaceWithLinearConstraints. Since PR #247.
• Added inner constructor to CartesianDiscreteModel allowing to build a model that represents a subgrid of a larger grid. Since PR #245.

Changed

• The part associated with the imposition of constraints in the FESpace interface has changed slightly. Since PR #247.
• Simplified the signature of zero_free_values(::FESpace). Since PR #249.
• Simplified the signature of zero_initial_guess(op::NonlinearOperator). Since PR #249.
• Major refactoring in the Assembler interface. Important change: Now, assembly-related functions take the data returned by functions like collect_cell_matrix as it is. Example: the old user code assemble_matrix(assembler,collect_cell_matrix(du,dv,terms)...) now is written simply as assemble_matrix(assembler,collect_cell_matrix(du,dv,terms)), i.e., the unpack of the last argument is not used anymore. In addition, with the new assembler interface, it is possible to customize the assembly process via a so-called AssemblerStrategy object. Since PR #249.
• Change the types of the sizes and partition fields of CartesianDescriptor to tuples instead of points. Since PR #246.

[0.9.2] - 2020-04-26

Added

• Automatic differentiation of manufactured solutions. Since PR #236.

[0.9.1] - 2020-04-20

Added

• Function cell_measure. Since PR #234.

Fixed

• Several bugs associated with ExtendedFESpace. In particular, we have fixed a bug that showed up when combining ZeroMeanFESpace and ExtendedFESpace. Since PR #234.

[0.9.0] - 2020-04-18

Added

• Function HomogeneousTrialFESpace. Since PR #226.
• Function lazy_append in order to lazily append two objects (implemented for AbstractVector, Triangulation, and CellQuadrature). Since PR #220.
• Support for FE spaces with DOFs defined in the physical space. Since PR #216 and #218.

Changed

• Replaced non_linear -> nonlinear and NonLinear -> Nonlinear. Since PR #223.
• The FESpace interface has slightly changed, mainly the return type of functions get_cell_basis and get_cell_dof_basis.. Since PR #216 and #218.

Fixed

• Bug that showed up in multi-field computations when some field had no contribution to the rhs vector. Since #229.
• Bug in gradient operator in the void part of ExtendedFESpace objects. Since PR #219.
• Bug in jumps of quantities restricted to InterfaceTriangulation objects. Since PR #215.

[0.8.0] - 2020-03-17

Added

• Support for surface-coupled multi-physics. See SurfaceCouplingTests.jl for further details. Since PR #209.
• Support for constitutive laws with state / historical variables. See IsotropicDamageTests.jl for further details. Since PR #208.
• Curl-conforming reference FE NedelecRefFE and corresponding FE space constructor since PR #199.
• New constructors AffineFETermFromCellMatVec and FETermFromCellJacRes that provides full control in the definition of cell matrices and vectors. Since PR #191.
• Support for simultaneous integration of matrices and vectors. Since PR #191.

Changed

• Renaming NonLinear to Nonlinear since it is one word and it is not consistent with style

• The definition of interpolation order in Raviart-Thomas and Nédélec reference FEs has changed. Now, the divergence of functions in the Raviart-Thomas space of order k belongs to P_k or Q_k depending on the underlying polytope. Idem for Nédelec, but using the curl instead of the divergence. Since PR #212.

• The order in which test and trial spaces are written in the code has changed and also the other in the arguments of functions defining bi-linear and linear forms, and weak residuals and Jacobians. This affects everybody that is using Gridap, even the most basic users. Now, we write the trial space before the test one in all methods taking two spaces in their arguments. E.g., we have changed AffineFEOperator(V,U,terms...) to AffineFEOperator(U,V,terms...), where U is the trial and V is the test space. For functions defining weak forms, now we have: The new signatures for bi-linear and a linear forms are a(u,v), l(v), where u is a trial function and v is a test one. For weak Jacobians and residuals jac(u,du,v) and res(u,v), where u is the (trial) function in which we evaluate these quantities, du is the direction in which we evaluate the Jacobian and v is a test function. Since PR #195 and PR #197.

• The part related with the application of constraints in the FESpace interface has changed. Since PR #191.

Fixed

• Bug in 1d Cartesian grids. Since PR #192.

[0.7.1] - 2020-02-18

Added

• New DirichletFESpace that can be used to compute matrices and vectors associated with the Dirichlet DOFs. Since commit 972afcc

[0.7.0] - 2020-02-13

This version is a major refactoring of the project which is not summarized here for the sake of brevity. Most of the functionality of v0.6.0 is available in v0.7.0, but with a possibly slightly different API. See here the changes in the sources of the Gridap Tutorials between versions 0.6.0 and 0.7.0 to effectively see the major changes in the API.

[0.6.0] - 2020-01-24

Added

• New GenericRefFE. Since commit 876ef1e
• New NedelecRefFE constructor that generates Nedelec FEs of arbitrary order in 2D and 3D on hex. Since commit 876ef1e
• New keyword argument map in the constructor of CartesianModel, which allows one to transform the original domain, by default [0,1]^d to a new domain through a homeomorphic map. Since commit 30cc4bc
• New keyword argument map in the constructor of CartesianGrid and a new map attribute in this structure, since commit 30cc4bc
• CartesianGridPoints has new attribute map since commit 30cc4bc
• Added SparseMatricesCSR support to SparseMatrixAssembler and MultiSparseMatrixAssembler in PR #118.

Changed

• The RaviartThomasRefFE has now been replaced by GenericRefFE, and the constructor for Raviart-Thomas FEs is called RTRefFE. Since commit 876ef1e
• The default map in the CartesianModel constructor is [0,1]^d instead of [-1,1]^d, since commit 30cc4bc
• CartesianGrid has attribute map since commit 30cc4bc

[0.5.2] - 2019-10-22

Fixed

• Incompatibility problem with TensorValues version 0.3.5. Via commit 3c0682a.

[0.5.1] - 2019-10-03

Added

• Pretty printing for the types most exposed to users. Since PR #109.

Fixed

• Bug related to ZeroMeanFESpace. Via PR #111.

[0.5.0] - 2019-09-27

Added

• Added a high level constructor, namely FESpace, to create different types of FE spaces. See issue #100 for more details. Since PR #102.
• Added ZeroMeanFESpace to construct FE spaces whose functions have zero mean value. Since PR #102.
• Added Hdiv FE space using Raviart-Thomas reference FEs in 34bfa34
• Added the corresponding DOF basis for Raviart-Thomas reference FEs for interpolation of fields 60b9021
• Added an arbitrary order div-conforming Raviart-Thomas reference FE of arbitrary order on quads in commit 60b9021
• Now, the tags argument is optional when constructing SkeletonTriangulation and BoundaryTriangulation objects from a DiscreteModel. Since commit e6424a3.
• Added mean operator for quantities restricted to a SkeletonTriangulation. Since commit 83798b4.
• Extended NormalVector to SkeletonTriangulations. Since commit 5fb8487.
• Now, TrialFESpaces can be constructed from values instead of functions if the corresponding Dirichlet conditions are constant. Since commit bae237e.
• Added the possibility of adding new tags to a FaceLabels object via the function add_tag_from_tags! and using it to construct FE spaces. Since commit e9dfac4.
• Added BackslashSolver to facilitate the usage in Gridap of the build-in Julia backslash linear solver. Since commit 8e3a9b7.
• Added NLSolver to facilitate the usage in Gridap of the non-linear solvers available in the official Julia package NLsolve. Introduced in commit e5a933f as JuliaNLSolver. Renamed to NLSolver in PR #108.

Changed

• The Signature of solve! for NumericalSetup objects. The argument for the system matrix has been removed. The information about the matrix is already in the NumericalSetup object. Since commit ac212d3.
• The signature of solve!(::FEFunction,::FESolver,::FEOperator). Before it was used as cache = solve!(uh,solver,op), now it is used as uh, cache = solve!(uh,solver,op). Since PR #102.
• Previous ConformingFESpace constructor is H1ConformingFESpace since 34bfa34

Deprecated

• JuliaNLSolver. Renamed to NLSolver. Since PR #108.
• Key-word argument order in CellQuadrature constructor. Renamed to degree. Since PR #108.

Fixed

• Bug in @law macro for more than one FEBasis arguments. Solved via PR #104.
• Bug in NonlinearFEOperator constructor with default assembler in multi-field computations. Solved via PR #104.
• Bug in NormalVector for non-Cartesian grids. Solved via PR #98.

[0.4.0] - 2019-09-07

Added

• Added support to high order simplicial Lagrangian finite elements. Since commit cbefe9b.
• Now the built-in simplicial grids are oriented. Since commit cbefe9b.
• Added binary operations between FEFunction and Number, and FEBasis and Number. Since PR #88.
• Added PDiscRefFE, DiscFESpace, and ConstrainedFESpace. Since PR #88.
• Now its possible to pass a CellNumber or an Array of numbers into a constitutive law. Useful to identify which is the material of the current Gauss point in multi-material problems. Since commit 62cb2c3.
• LinearFESolver is now optional for solving a LinearFEOperator. Since commit 5c1caa8.
• Assembler is now optional to build FEOperator objects. Since commit b1bf517.
• Binary operations between Function and FEFunction. Since commit a7f22f5.
• Extended constructions of CLagrangianFESpace and DLagrangianFESpace. diritags and dirimasks are now optional. diritags can now be also a vector of String. Since commit 776b402.
• Added div, curl, and trace operators. Since commit 5a0f322.
• Macro @law to facilitate the definition of constitutive laws. Since commit 30b67f2.
• Definition of linear forms b(v) = inner(v, f) directly from a function f. Since commit bb42847
• Serialization and de-serialization of DiscreteModel objects into and from json format. Since PR #76.
• Support for boundary integration (e.g., Neumann BCs) for multi-field computations. Since PR #75.

Changed

• Signature of LagrangianRefFE constructor. Since commit 529c764.

Fixed

• Bug in LinearFETerm for multi-field computations. Fixed via commit 2b957d1.
• Bug in MultiCellArray constructor. Fixed via commit bbc3b1c.
• Bug in binary operations between FEFunction and FEBasis. Fixed via commit aa49689.

[0.3.0] - 2019-08-06

Added

• CurlGradMonomialBasis spanning the polynomial space needed for RT elements on n-cubes.
• CLagrangianFESpace and DLagrangianFESpace types providing an efficient implementation for continuous and discontinuous Lagrangian FE spaces respectively. In contrast to ConfirmingFESpace, the new types allow to select which are the components that are actually prescribed on the Dirichlet boundary. Since PR #64.
• simplexify function to convert Grid and DiscreteModel objects made of n-cubes to the corresponding counterparts made of n-simplices. Since PR #62.
• Duffy transformation based integration for n-simplices of arbitrary dimension. Since PR #61.
• NormalVector to construct the outward normal vector to a given BoundaryTriangulation. Since PR #60.
• Support for tensor-valued FE computations. Since PR #57.
• Support for integration on the skeleton of the mesh. This includes SkeletonTriangulation, an integration mesh for the skeleton, restrict function is extended to restrict to the skeleton, jump function to compute jumps of CellFields and CellBasis restricted to the skeleton, extension of FETerms to allow integration on the skeleton. See PR #47
• Support for Robin boundary conditions. Since commit 946054a
• Support for Neumann boundary conditions. Since commit 4dcd16f
• FETerm and AffineFETerm abstract types and several concrete implementations. They allow to deal with problems whose weak form has terms integrated over different geometrical entities. NonlinearFEOperator and LinearFEOperator can be constructed using several terms. Since commit 0f99234
• Extended Assembler and MultiAssembler to deal with several terms. See issue #42 and PR #43.
• IdentityCellNumber, an indexable cell number that simply returns the given index. Also efficient implementation of reindex for this type (i.e. do nothing). Available since commit b6b4c32
• Function restrict for restricting CellField and CellBasis objects to surfaces. Available since commit e981f3c
• BoundaryTriangulation an integration mesh used to integrate CellField and CellBasis objects restricted on a surface. Available since commit e981f3c
• NonIterableCellMap, a cell map that has iteration intentionally disabled. Available since commit 956a537.
• CompressedCellValue, CompressedCellArray, and CompressedCellMap, as well as efficient versions of apply, evaluate, and reindex for these types. See PR #41 for more details.
• NEWS.md file (a changelog file)

Changed

• Domains are now in [0,1] instead of [-1,1]. Quadratures and nodes arrays modified accordingly. Since commit 268dfe1.
• Changed the signature of assemble, apply_constraints, apply_constraints_rows, and apply_constraints_cols to support FE assembly of several terms, which are integrated in different domains. The old API of asseble is still functional, but not for the apply_constraints et al. Since PR #43. Further changed in commit a335aed.

Fixed

• Bug in generation of the cellwise local to global DOF map for high order interpolations. Fixed via PR #56.
• Bug in numerical integration. There was a bug for computations where the number of cell DOFs was different from the number of integration points. Fixed via commit 0b3d4bf

[0.2.0] - 2019-06-29

A changelog is not maintained for this version.

This version introduces the core finite element machinery for linear and non-linear problems, single field and multi-field problems with terms integrated over the interior of the computational domain.

[0.1.0] - 2019-05-20

A changelog is not maintained for this version.

This version is non functional. It is just a tag for registering the package.