cleaned up assembling and dirichlet BC

examples/init/stokes.dat.2d

@@ -6,7 +6,7 @@ stokesMesh->num cells: 4 4
 
 stokes->mesh: stokesMesh
 
-stokes->solver->name: bicgstab_ell
+stokes->solver->name: direct
 stokes->solver->ell: 3
 stokes->solver->max iteration: 1000
 stokes->solver->relative tolerance: 1e-8

src/amdis/CMakeLists.txt

@@ -25,7 +25,6 @@ install(FILES
     CreatorInterface.hpp
     CreatorMap.hpp
     DirichletBC.hpp
-    DirichletBC.inc.hpp
     FileWriter.hpp
     Flag.hpp
     GridFunctionOperator.hpp

src/amdis/DirichletBC.hpp

@@ -6,7 +6,9 @@
 #include <vector>
 
 #include <dune/common/hybridutilities.hh>
+#include <dune/functions/functionspacebases/boundarydofs.hh>
 #include <dune/functions/functionspacebases/interpolate.hh>
+#include <dune/functions/functionspacebases/subspacebasis.hh>
 
 #include <amdis/Boundary.hpp>
 #include <amdis/Output.hpp>
@@ -14,6 +16,7 @@
 #include <amdis/common/ValueCategory.hpp>
 #include <amdis/utility/RangeType.hpp>
 #include <amdis/utility/TreeData.hpp>
+#include <amdis/utility/Visitor.hpp>
 
 namespace AMDiS
 {
@@ -48,66 +51,61 @@ namespace AMDiS
     /// Prepare the matrix, rhs and solution block for assembling dirichlet
     /// boundary conditions, e.g. collect the corresponding indices of boundary
     /// DOFS for later elimination in \ref finish.
-    template <class Matrix, class VectorX, class VectorB, class RowBasis, class ColBasis>
-    void init(Matrix& /*matrix*/, VectorX& /*rhs*/, VectorB& /*solution*/,
-              RowBasis const& rowBasis,
-              ColBasis const& /*colBasis*/)
+    template <class Matrix, class VectorX, class VectorB, class RowNode, class ColNode>
+    void init(Matrix& /*matrix*/, VectorX& /*solution*/, VectorB& rhs,
+              RowNode const& rowNode, ColNode const&)
     {
       if (!initialized_) {
-        using RowNode = typename RowBasis::LocalView::Tree;
-        initImpl(rowBasis, typename RowNode::NodeTag{});
+        forEachLeafNode_(rowNode, [&](auto const& /*node*/, auto const& tp) {
+          auto subBasis = Dune::Functions::subspaceBasis(rhs.basis(), cat(rowNode.treePath(),tp));
+          this->initImpl(subBasis);
+        });
         initialized_ = true;
       }
     }
 
 
-
     /// \brief Apply dirichlet BC to matrix and vector, i.e., add a unit-row
     /// to the matrix and optionally delete the corresponding matrix-column.
-    /** If DBC is set for matrix block {R,C}, then \p apply_row means that
-      * the block-row R is assembled, and \p apply_col means that the block-col C
-      * is assembled. The \p matrix, \p rhs, and \p solution correspond to the
-      * currently visited blocks of system-matrix and system-vector.
-      **/
-    template <class Matrix, class VectorX, class VectorB, class RowBasis, class ColBasis>
-    void finish(Matrix& matrix,
-                VectorX& rhs,
-                VectorB& solution,
-                RowBasis const& rowBasis,
-                ColBasis const& colBasis)
+    template <class Matrix, class VectorX, class VectorB, class RowNode, class ColNode>
+    void finish(Matrix& matrix, VectorX& solution, VectorB& rhs,
+                RowNode const& rowNode, ColNode const& colNode)
     {
       test_exit_dbg(initialized_, "Boundary condition not initialized!");
       auto columns = matrix.applyDirichletBC(dirichletNodes_);
 
-      using Dune::Functions::interpolate;
-      Dune::Hybrid::ifElse(std::is_same<RangeType_t<typename RowBasis::LocalView::Tree>, Range>{},
+      Dune::Hybrid::ifElse(std::is_same<RangeType_t<RowNode>, Range>{},
         [&](auto id) {
-          interpolate(id(rowBasis), rhs, values_, dirichletNodes_);
+          auto subBasis = Dune::Functions::subspaceBasis(rhs.basis(), rowNode.treePath());
+          Dune::Functions::interpolate(subBasis, rhs, values_, dirichletNodes_);
         });
 
-      Dune::Hybrid::ifElse(std::is_same<RangeType_t<typename ColBasis::LocalView::Tree>, Range>{},
+      Dune::Hybrid::ifElse(std::is_same<RangeType_t<ColNode>, Range>{},
         [&](auto id) {
-          interpolate(id(colBasis), solution, values_, dirichletNodes_);
+          auto subBasis = Dune::Functions::subspaceBasis(solution.basis(), colNode.treePath());
+          Dune::Functions::interpolate(subBasis, solution, values_, dirichletNodes_);
         });
 
       // subtract columns of dirichlet nodes from rhs
-      // for (auto const& triplet : columns)
-      //   rhs[triplet.row] -= triplet.value * solution[triplet.col];
+      for (auto const& triplet : columns)
+        rhs[triplet.row] -= triplet.value * solution[triplet.col];
+
       initialized_ = false;
     }
 
   protected:
-    template <class RowBasis>
-    void initImpl(RowBasis const& rowBasis, Dune::TypeTree::LeafNodeTag);
-
-    template <class RowBasis>
-    void initImpl(RowBasis const& rowBasis, Dune::TypeTree::PowerNodeTag);
-
-    template <class RowBasis>
-    void initImpl(RowBasis const& rowBasis, Dune::TypeTree::CompositeNodeTag);
-
-    template <class RB, class RowNodeTag>
-    void initImpl(RB const&, RowNodeTag) {}
+    // fill \ref dirichletNodes_ with 1 or 0 whether DOF corresponds to the boundary or not.
+    template <class SubBasis>
+    void initImpl(SubBasis const& subBasis)
+    {
+      using Dune::Functions::forEachBoundaryDOF;
+      using LV = typename SubBasis::LocalView;
+      using I = typename SubBasis::GridView::Intersection;
+      dirichletNodes_.resize(subBasis.dimension());
+      forEachBoundaryDOF(subBasis, [&](int localIndex, LV const& localView, I const& intersection) {
+        dirichletNodes_[localView.index(localIndex)] = predicate_(intersection.geometry().center());
+      });
+    }
 
   private:
     std::function<bool(Domain)> predicate_;
@@ -131,5 +129,3 @@ namespace AMDiS
   using Constraints = MatrixData<RowBasis, ColBasis, DirichletData<RowBasis>::template type>;
 
 } // end namespace AMDiS
-
-#include "DirichletBC.inc.hpp"

src/amdis/DirichletBC.inc.hpp

-#pragma once
-
-#include <dune/functions/functionspacebases/boundarydofs.hh>
-#include <dune/functions/functionspacebases/interpolate.hh>
-#include <dune/functions/functionspacebases/subspacebasis.hh>
-
-namespace AMDiS
-{
-  template <class WorldVector, class Range>
-    template <class RowBasis>
-  void DirichletBC<WorldVector, Range>::initImpl(
-      RowBasis const& rowBasis, Dune::TypeTree::LeafNodeTag)
-  {
-    using Dune::Functions::forEachBoundaryDOF;
-    using LV = typename RowBasis::LocalView;
-    using I = typename RowBasis::GridView::Intersection;
-    dirichletNodes_.resize(rowBasis.dimension());
-    forEachBoundaryDOF(rowBasis, [&](int localIndex, LV const& localView, I const& intersection) {
-      dirichletNodes_[localView.index(localIndex)] = predicate_(intersection.geometry().center());
-    });
-  }
-
-  template <class WorldVector, class Range>
-    template <class RowBasis>
-  void DirichletBC<WorldVector, Range>::initImpl(
-      RowBasis const& rowBasis, Dune::TypeTree::PowerNodeTag)
-  {
-    using Dune::Functions::subspaceBasis;
-    using Node = typename RowBasis::LocalView::Tree;
-    using ChildNode = typename Node::template Child<0>::type;
-
-    auto tp = rowBasis.prefixPath();
-    auto const& basis = rowBasis.rootBasis();
-    for (std::size_t i = 0; i < degree(rowBasis.localView().tree()); ++i)
-      initImpl(subspaceBasis(basis, push_back(tp,i)), typename ChildNode::NodeTag{});
-  }
-
-  template <class WorldVector, class Range>
-    template <class RowBasis>
-  void DirichletBC<WorldVector, Range>::initImpl(
-      RowBasis const& rowBasis, Dune::TypeTree::CompositeNodeTag)
-  {
-    using Dune::Functions::subspaceBasis;
-    using Node = typename RowBasis::LocalView::Tree;
-    auto tp = rowBasis.prefixPath();
-    auto const& basis = rowBasis.rootBasis();
-    forEach(range_<0,Node::CHILDREN>, [&,this](auto const _i) {
-      using ChildNode = typename Node::template Child<decltype(_i)::value>::type;
-      this->initImpl(subspaceBasis(basis, push_back(tp,_i)), typename ChildNode::NodeTag{});
-    });
-  }
-
-} // end namespace AMDiS

src/amdis/ProblemStat.hpp

@@ -282,8 +282,7 @@ namespace AMDiS
 
     void initGlobalBasis(GlobalBasis const& globalBasis)
     {
-      localView_ = std::make_shared<typename GlobalBasis::LocalView>(globalBasis_->localView());
-      constraints_.init(localView_->tree(), localView_->tree(), tag::store{});
+      constraints_.init(*globalBasis_, *globalBasis_);
     }
 
     void createMatricesAndVectors()
@@ -292,7 +291,8 @@ namespace AMDiS
       solution_ = std::make_shared<SystemVector>(*globalBasis_);
       rhs_ = std::make_shared<SystemVector>(*globalBasis_);
 
-      AMDiS::forEachNode_(localView_->tree(), [&,this](auto const& node, auto treePath)
+      auto localView = globalBasis_->localView();
+      AMDiS::forEachNode_(localView.tree(), [&,this](auto const& node, auto treePath)
       {
         std::string i = to_string(treePath);
         estimates_[i].resize(globalBasis_->gridView().indexSet().size(0));
@@ -358,7 +358,6 @@ namespace AMDiS
 
     /// FE spaces of this problem.
     std::shared_ptr<GlobalBasis> globalBasis_;
-    std::shared_ptr<typename GlobalBasis::LocalView> localView_;
 
     /// A FileWriter object
     std::list<std::shared_ptr<FileWriterInterface>> filewriter_;

src/amdis/ProblemStat.inc.hpp

@@ -120,7 +120,8 @@ void ProblemStat<Traits>::initialize(
 template <class Traits>
 void ProblemStat<Traits>::createMarker()
 {
-  AMDiS::forEachNode_(localView_->tree(), [&,this](auto const& node, auto treePath)
+  auto localView = globalBasis_->localView();
+  AMDiS::forEachNode_(localView.tree(), [&,this](auto const& node, auto treePath)
   {
     std::string componentName = name_ + "->marker[" + to_string(treePath) + "]";
 
@@ -144,7 +145,8 @@ void ProblemStat<Traits>::createMarker()
 template <class Traits>
 void ProblemStat<Traits>::createFileWriter()
 {
-  forEachNode_(localView_->tree(), [&,this](auto const& node, auto treePath)
+  auto localView = globalBasis_->localView();
+  forEachNode_(localView.tree(), [&,this](auto const& node, auto treePath)
   {
     std::string componentName = name_ + "->output[" + to_string(treePath) + "]";
 
@@ -166,8 +168,9 @@ addDirichletBC(Predicate const& predicate, RowTreePath row, ColTreePath col, Val
   static_assert( Concepts::Functor<Predicate, bool(WorldVector)>,
     "Function passed to addDirichletBC for `predicate` does not model the Functor<bool(WorldVector)> concept");
 
-  auto i = child(localView_->tree(), makeTreePath(row));
-  auto j = child(localView_->tree(), makeTreePath(col));
+  auto localView = globalBasis_->localView();
+  auto i = child(localView.tree(), makeTreePath(row));
+  auto j = child(localView.tree(), makeTreePath(col));
 
   auto valueGridFct = makeGridFunction(values, globalBasis_->gridView());
 
@@ -261,40 +264,36 @@ buildAfterAdapt(AdaptInfo& /*adaptInfo*/, Flag /*flag*/, bool asmMatrix, bool as
   rhs_->init(asmVector);
   solution_->resize(*globalBasis_);
 
-  forEachNode_(localView_->tree(), [&,this](auto const& rowNode, auto rowTreePath) {
-    auto rowBasis = Dune::Functions::subspaceBasis(*globalBasis_, rowTreePath);
-    forEachNode_(localView_->tree(), [&,this](auto const& colNode, auto colTreePath) {
-      auto colBasis = Dune::Functions::subspaceBasis(*globalBasis_, colTreePath);
+  auto localView = globalBasis_->localView();
+  forEachNode_(localView.tree(), [&,this](auto const& rowNode, auto) {
+    forEachNode_(localView.tree(), [&,this](auto const& colNode, auto) {
       for (auto bc : constraints_[rowNode][colNode])
-        bc->init(*systemMatrix_, *solution_, *rhs_, rowBasis, colBasis);
+        bc->init(*systemMatrix_, *solution_, *rhs_, rowNode, colNode);
     });
   });
   msg("{} total DOFs", globalBasis_->dimension());
 
   // 2. traverse grid and assemble operators on the elements
   for (auto const& element : elements(gridView())) {
-    localView_->bind(element);
-    auto geometry = element.geometry();
+    localView.bind(element);
 
     if (asmMatrix)
-      systemMatrix_->assemble(element, geometry, *localView_, *localView_);
+      systemMatrix_->assemble(localView, localView);
     if (asmVector)
-      rhs_->assemble(element, geometry, *localView_);
+      rhs_->assemble(localView);
 
-    localView_->unbind();
+    localView.unbind();
   }
 
   // 3. finish matrix insertion and apply dirichlet boundary conditions
   systemMatrix_->finish(asmMatrix);
   rhs_->finish(asmVector);
 
-  forEachNode_(localView_->tree(), [&,this](auto const& rowNode, auto rowTreePath) {
-    auto rowBasis = Dune::Functions::subspaceBasis(*globalBasis_, rowTreePath);
-    forEachNode_(localView_->tree(), [&,this](auto const& colNode, auto colTreePath) {
-      auto colBasis = Dune::Functions::subspaceBasis(*globalBasis_, colTreePath);
+  forEachNode_(localView.tree(), [&,this](auto const& rowNode, auto) {
+    forEachNode_(localView.tree(), [&,this](auto const& colNode, auto) {
       // finish boundary condition
       for (auto bc : constraints_[rowNode][colNode])
-        bc->finish(*systemMatrix_, *solution_, *rhs_, rowBasis, colBasis);
+        bc->finish(*systemMatrix_, *solution_, *rhs_, rowNode, colNode);
     });
   });
 

src/amdis/linear_algebra/CMakeLists.txt

 install(FILES
     Common.hpp
     DOFMatrixBase.hpp
+    DOFMatrixBase.inc.hpp
     DOFVectorBase.hpp
+    DOFVectorBase.inc.hpp
     DOFVectorInterface.hpp
     HierarchicWrapper.hpp
     LinearSolver.hpp

src/amdis/linear_algebra/Common.hpp

@@ -7,7 +7,7 @@ namespace AMDiS
   template <class T>
   struct Triplet
   {
-    std::size_t row, cols;
+    std::size_t row, col;
     T value;
   };
 

src/amdis/linear_algebra/DOFMatrixBase.hpp

@@ -4,10 +4,7 @@
 
 #include <dune/common/timer.hh>
 
-#include <amdis/Assembler.hpp>
-#include <amdis/LocalAssembler.hpp>
 #include <amdis/LocalAssemblerList.hpp>
-#include <amdis/LocalOperator.hpp>
 #include <amdis/common/Math.hpp>
 #include <amdis/utility/MultiIndex.hpp>
 #include <amdis/utility/TreePath.hpp>
@@ -40,10 +37,8 @@ namespace AMDiS
     DOFMatrixBase(RowBasis const& rowBasis, ColBasis const& colBasis)
       : rowBasis_(&rowBasis)
       , colBasis_(&colBasis)
-      , rowLocalView_(rowBasis.localView())
-      , colLocalView_(colBasis.localView())
     {
-      operators_.init(rowLocalView_.tree(), colLocalView_.tree(), tag::store{});
+      operators_.init(rowBasis, colBasis);
     }
 
     /// Return the row-basis \ref rowBasis of the matrix
@@ -84,46 +79,15 @@ namespace AMDiS
 
     /// Initialize the matrix for insertion, e.g. allocate the non-zero pattern
     /// If \p setToZero is true, the matrix is set to 0
-    void init(bool asmMatrix)
-    {
-      backend_.init(*rowBasis_, *colBasis_, asmMatrix);
-
-      auto const rowSize = rowBasis_->localView().maxSize();
-      auto const colSize = colBasis_->localView().maxSize();
-      elementMatrix_.resize(rowSize, colSize);
-    }
+    void init(bool asmMatrix);
 
     /// Finish the matrix insertion, e.g. cleanup or final insertion
-    void finish(bool asmMatrix)
-    {
-      backend_.finish();
-
-      if (asmMatrix) {
-        forEachNode_(rowBasis_->localView().tree(), [&,this](auto const& rowNode, auto&&) {
-          forEachNode_(colBasis_->localView().tree(), [&,this](auto const& colNode, auto&&) {
-            auto& matOp = operators_[rowNode][colNode];
-            if (matOp.doAssemble())
-              matOp.assembled = true;
-          });
-        });
-      }
-    }
+    void finish(bool asmMatrix);
 
     /// Insert a block of values into the matrix (add to existing values)
     void insert(RowLocalView const& rowLocalView,
                 ColLocalView const& colLocalView,
-                ElementMatrix const& elementMatrix)
-    {
-      for (size_type i = 0; i < rowLocalView.size(); ++i) {
-        size_type const row = flatMultiIndex(rowLocalView.index(i));
-        for (size_type j = 0; j < colLocalView.size(); ++j) {
-          if (std::abs(elementMatrix[i][j]) > threshold<double>) {
-            size_type const col = flatMultiIndex(colLocalView.index(j));
-            backend_.insert(row, col, elementMatrix[i][j]);
-          }
-        }
-      }
-    }
+                ElementMatrix const& elementMatrix);
 
     /// Insert a single value into the matrix (add to existing value)
     template <class RowIndex, class ColIndex>
@@ -138,53 +102,18 @@ namespace AMDiS
       return operators_[row][col];
     }
 
+    /// Associate a local operator with this DOFMatrix
     template <class ContextTag, class Operator,
               class RowTreePath = RootTreePath, class ColTreePath = RootTreePath>
     void addOperator(ContextTag contextTag, Operator const& preOp,
-                     RowTreePath row = {}, ColTreePath col = {})
-    {
-      static_assert( Concepts::PreTreePath<RowTreePath>,
-          "row must be a valid treepath, or an integer/index-constant");
-      static_assert( Concepts::PreTreePath<ColTreePath>,
-          "col must be a valid treepath, or an integer/index-constant");
+                     RowTreePath row = {}, ColTreePath col = {});
 
-      auto i = child(rowBasis_->localView().tree(), makeTreePath(row));
-      auto j = child(colBasis_->localView().tree(), makeTreePath(col));
+    /// Assemble the matrix operators on the bound element.
+    void assemble(RowLocalView const& rowLocalView,
+                  ColLocalView const& colLocalView);
 
-      using Context = typename ContextTag::type;
-      auto op = makeLocalOperator<Context>(preOp, rowBasis_->gridView());
-      auto localAssembler = makeLocalAssemblerPtr<Context>(std::move(op), i, j);
-
-      operators_[i][j].push(contextTag, localAssembler);
-      operators_[i][j].changing = true;
-    }
-
-    // Assemble the operators on the `element`. Assume that `rowLocalView`
-    // and `colLocalView` are already bound to the element.
-    void assemble(Element const& element, Geometry const& geometry,
-                  RowLocalView const& rowLocalView,
-                  ColLocalView const& colLocalView)
-    {
-      elementMatrix_ = 0;
-
-      forEachNode_(rowLocalView.tree(), [&](auto const& rowNode, auto&&) {
-        forEachNode_(colLocalView.tree(), [&](auto const& colNode, auto&&) {
-          auto& matOp = operators_[rowNode][colNode];
-          if (matOp.doAssemble() && !matOp.empty()) {
-            matOp.bind(element, geometry);
-            auto matAssembler = [&](auto const& context, auto& operators) {
-              for (auto scaled : operators)
-                scaled.op->assemble(context, rowNode, colNode, elementMatrix_);
-            };
-
-            assembleOperators(rowBasis_->gridView(), element, matOp, matAssembler);
-            matOp.unbind();
-          }
-        });
-      });
-
-      insert(rowLocalView, colLocalView, elementMatrix_);
-    }
+    /// Assemble all matrix operators, TODO: incooperate boundary conditions
+    void assemble();
 
     /// \brief Deletes all rows with \p dirichletNodes != 0 and if \p apply is true, adds
     /// a one on the diagonal of the matrix.
@@ -199,13 +128,9 @@ namespace AMDiS
     }
 
   protected:
-    /// The finite element space / basis associated with the data matrix
-    RowBasis const*	rowBasis_;
-    ColBasis const*	colBasis_;
-
-    /// The LocalViews aassociated with the row/col basis
-    RowLocalView rowLocalView_;
-    ColLocalView colLocalView_;
+    /// The finite element space / basis associated with the rows/columns
+    RowBasis const* rowBasis_;
+    ColBasis const* colBasis_;
 
     /// Data backend
     Backend backend_;
@@ -218,3 +143,5 @@ namespace AMDiS
   };
 
 } // end namespace AMDiS
+
+#include "DOFMatrixBase.inc.hpp"

src/amdis/linear_algebra/DOFMatrixBase.inc.hpp

+#pragma once
+
+#include <amdis/Assembler.hpp>
+#include <amdis/LocalAssembler.hpp>
+#include <amdis/LocalOperator.hpp>
+#include <amdis/utility/Visitor.hpp>
+
+namespace AMDiS {
+
+template <class RB, class CB, class B>
+void DOFMatrixBase<RB,CB,B>::
+init(bool asmMatrix)
+{
+  backend_.init(*rowBasis_, *colBasis_, asmMatrix);
+
+  auto const rowSize = rowBasis_->localView().maxSize();
+  auto const colSize = colBasis_->localView().maxSize();
+  elementMatrix_.resize(rowSize, colSize);
+}
+
+
+template <class RB, class CB, class B>
+void DOFMatrixBase<RB,CB,B>::
+finish(bool asmMatrix)
+{
+  backend_.finish();
+
+  if (asmMatrix) {
+    forEachNode_(rowBasis_->localView().tree(), [&](auto const& rowNode, auto) {
+      forEachNode_(colBasis_->localView().tree(), [&](auto const& colNode, auto) {
+        auto& matOp = operators_[rowNode][colNode];
+        if (matOp.doAssemble())
+          matOp.assembled = true;
+      });
+    });
+  }
+}
+
+
+template <class RB, class CB, class B>
+void DOFMatrixBase<RB,CB,B>::
+insert(RowLocalView const& rowLocalView, ColLocalView const& colLocalView,
+       ElementMatrix const& elementMatrix)
+{
+  for (size_type i = 0; i < rowLocalView.size(); ++i) {
+    size_type const row = flatMultiIndex(rowLocalView.index(i));
+    for (size_type j = 0; j < colLocalView.size(); ++j) {
+      if (std::abs(elementMatrix[i][j]) > threshold<double>) {
+        size_type const col = flatMultiIndex(colLocalView.index(j));
+        backend_.insert(row, col, elementMatrix[i][j]);
+      }
+    }
+  }
+}
+
+
+template <class RB, class CB, class B>
+  template <class ContextTag, class Operator, class RowTreePath, class ColTreePath>
+void DOFMatrixBase<RB,CB,B>::
+addOperator(ContextTag contextTag, Operator const& preOp,
+            RowTreePath row, ColTreePath col)
+{
+  static_assert( Concepts::PreTreePath<RowTreePath>,
+      "row must be a valid treepath, or an integer/index-constant");
+  static_assert( Concepts::PreTreePath<ColTreePath>,
+      "col must be a valid treepath, or an integer/index-constant");
+
+  auto i = child(rowBasis_->localView().tree(), makeTreePath(row));
+  auto j = child(colBasis_->localView().tree(), makeTreePath(col));
+
+  using Context = typename ContextTag::type;
+  auto op = makeLocalOperator<Context>(preOp, rowBasis_->gridView());
+  auto localAssembler = makeLocalAssemblerPtr<Context>(std::move(op), i, j);
+
+  operators_[i][j].push(contextTag, localAssembler);
+  operators_[i][j].changing = true;
+}
+
+
+template <class RB, class CB, class B>
+void DOFMatrixBase<RB,CB,B>::
+assemble(RowLocalView const& rowLocalView, ColLocalView const& colLocalView)
+{
+  elementMatrix_ = 0;
+  auto const& gv = rowBasis_->gridView();
+  auto const& element = rowLocalView.element();
+  auto geometry = element.geometry();
+
+  forEachNode_(rowLocalView.tree(), [&](auto const& rowNode, auto) {
+    forEachNode_(colLocalView.tree(), [&](auto const& colNode, auto) {
+      auto& matOp = operators_[rowNode][colNode];
+      if (matOp.doAssemble() && !matOp.empty()) {
+        matOp.bind(element, geometry);
+        auto matAssembler = [&](auto const& context, auto& operators) {
+          for (auto scaled : operators)
+            scaled.op->assemble(context, rowNode, colNode, elementMatrix_);
+        };
+        assembleOperators(gv, element, matOp, matAssembler);
+        matOp.unbind();
+      }
+    });
+  });
+
+  insert(rowLocalView, colLocalView, elementMatrix_);
+}
+
+
+template <class RB, class CB, class B>
+void DOFMatrixBase<RB,CB,B>::
+assemble()
+{
+  auto rowLocalView = rowBasis_->localView();
+  auto colLocalView = colBasis_->localView();
+