3 #ifndef DUNE_DUAL_Q1_LOCALFINITEELEMENT_HH
4 #define DUNE_DUAL_Q1_LOCALFINITEELEMENT_HH
8 #include <dune/common/fvector.hh>
9 #include <dune/common/fmatrix.hh>
11 #include <dune/geometry/type.hh>
12 #include <dune/geometry/referenceelements.hh>
13 #include <dune/geometry/quadraturerules.hh>
38 template<
class D,
class R,
int dim,
bool faceDual=false>
52 setupFaceDualCoefficients();
54 setupDualCoefficients();
86 static constexpr GeometryType
type ()
88 return GeometryTypes::cube(dim);
93 void setupFaceDualCoefficients();
96 void setupDualCoefficients();
103 template<
class D,
class R,
int dim,
bool faceDual>
104 void DualQ1LocalFiniteElement<D,R,dim,faceDual>::setupDualCoefficients()
107 const int size = 1 <<dim;
108 std::array<Dune::FieldVector<R, size>, size> coeffs;
112 const auto& quad = Dune::QuadratureRules<D,dim>::rule(type(), 2*dim);
115 Dune::FieldMatrix<R, size, size> massMat;
119 std::vector<Dune::FieldVector<R,1> > integral(size);
120 for (
int i=0; i<size; i++)
123 Dune::Impl::LagrangeCubeLocalBasis<D,R,dim,1> q1Basis;
124 for(
size_t pt=0; pt<quad.size(); pt++) {
126 const Dune::FieldVector<D ,dim>& pos = quad[pt].position();
127 std::vector<Dune::FieldVector<R,1> > q1Values(size);
128 q1Basis.evaluateFunction(pos,q1Values);
130 D weight = quad[pt].weight();
132 for (
int k=0; k<size; k++) {
133 integral[k] += q1Values[k]*weight;
135 for (
int l=0; l<=k; l++)
136 massMat[k][l] += weight*(q1Values[k]*q1Values[l]);
141 for (
int i=0; i<size-1; i++)
142 for (
int j=i+1; j<size; j++)
143 massMat[i][j] = massMat[j][i];
147 for (
int i=0; i<size; i++) {
149 Dune::FieldVector<R, size> rhs(0);
150 rhs[i] = integral[i];
153 massMat.solve(coeffs[i] ,rhs);
157 basis.setCoefficients(coeffs);
158 interpolation.setCoefficients(coeffs);
161 template<
class D,
class R,
int dim,
bool faceDual>
162 void DualQ1LocalFiniteElement<D,R,dim,faceDual>::setupFaceDualCoefficients()
165 const int size = 1 <<dim;
166 std::array<Dune::FieldVector<R, size>, size> coeffs;
169 Dune::Impl::LagrangeCubeLocalBasis<D,R,dim,1> q1Basis;
171 const auto& refElement = Dune::ReferenceElements<D,dim>::general(type());
174 for (
int i=0; i<refElement.size(1);i++) {
176 const auto& quad = Dune::QuadratureRules<D,dim-1>::rule(refElement.type(i,1),2*dim);
181 Dune::FieldMatrix<R, size/2, size/2> massMat;
185 const auto& geometry = refElement.template geometry<1>(i);
188 std::vector<Dune::FieldVector<R,1> > integral(size/2);
189 for (
int k=0; k<size/2; k++)
192 for(
size_t pt=0; pt<quad.size(); pt++) {
194 const auto& pos = quad[pt].position();
195 const auto& elementPos = geometry.global(pos);
197 std::vector<Dune::FieldVector<R,1> > q1Values(size);
198 q1Basis.evaluateFunction(elementPos,q1Values);
200 D weight = quad[pt].weight();
202 for (
int k=0; k<refElement.size(i,1,dim); k++) {
203 int row = refElement.subEntity(i,1,k,dim);
204 integral[k] += q1Values[row]*weight;
206 for (
int l=0; l<refElement.size(i,1,dim); l++) {
207 int col = refElement.subEntity(i,1,l,dim);
208 massMat[k][l] += weight*(q1Values[row]*q1Values[col]);
216 for (
int l=0; l<refElement.size(i,1,dim); l++) {
218 int row = refElement.subEntity(i,1,l,dim);
219 Dune::FieldVector<R, size/2> rhs(0);
220 rhs[l] = integral[l];
222 Dune::FieldVector<R, size/2> x(0);
223 massMat.solve(x ,rhs);
225 for (
int k=0; k<refElement.size(i,1,dim); k++) {
226 int col = refElement.subEntity(i,1,k,dim);
227 coeffs[row][col]=x[k];
232 basis.setCoefficients(coeffs);
233 interpolation.setCoefficients(coeffs);