DUNE PDELab (git)

eval.hh
1// -*- tab-width: 4; indent-tabs-mode: nil -*-
2#ifndef DUNE_PDELAB_LOCALOPERATOR_EVAL_HH
3#define DUNE_PDELAB_LOCALOPERATOR_EVAL_HH
4
5#include <vector>
6
8
9namespace Dune {
10 namespace PDELab {
11
16 template< class DomainType,
17 class LFS,
18 class LV,
19 class RangeFieldType>
20 inline void evalFunction( const DomainType& location, // expects element local coordinates!
21 const LFS& lfs,
22 const LV& xlocal,
23 RangeFieldType &valU
24 ){
25
26 typedef typename LFS::Traits::FiniteElementType::
27 Traits::LocalBasisType::Traits::RangeType RangeType; // normally = Dune::FieldVector<double,1>
28
29 std::vector<RangeType> phi(lfs.size());
30 lfs.finiteElement().localBasis().evaluateFunction( location, phi );
31
32 // evaluate u
33 valU = RangeFieldType(0.0);
34 for( std::size_t i=0; i<lfs.size(); i++ )
35 valU += xlocal( lfs, i ) * phi[i];
36 }
37
38
39
40
41 template< class DomainType,
42 class EG,
43 class LFS,
44 class LV,
45 class RangeType
46 >
47 inline void evalGradient( const DomainType& location, // expects element local coordinates!
48 const EG& eg,
49 const LFS& lfs,
50 const LV& xlocal,
51 RangeType &gradu
52 ){
53
54 typedef typename LFS::Traits::FiniteElementType::
55 Traits::LocalBasisType::Traits::JacobianType JacobianType;
56
57 typedef typename LFS::Traits::SizeType size_type;
58
59 std::vector<JacobianType> js(lfs.size());
60 lfs.finiteElement().localBasis().evaluateJacobian( location, js );
61
62 enum { dim = RangeType::dimension };
63 // transformation
64 typename EG::Geometry::JacobianInverseTransposed jac;
65
66 // transform gradients of shape functions to real element
67 jac = eg.geometry().jacobianInverseTransposed( location );
68 std::vector<RangeType> gradphi(lfs.size());
69 for (size_type i=0; i<lfs.size(); i++)
70 jac.mv( js[i][0], gradphi[i] );
71
72 // compute gradient of u
73 gradu = RangeType(0);
74 for (size_type i=0; i<lfs.size(); i++)
75 gradu.axpy( xlocal(lfs,i), gradphi[i] );
76
77 }
78
79
80 }
81}
82#endif // DUNE_PDELAB_LOCALOPERATOR_EVAL_HH
Implements a matrix constructed from a given type representing a field and compile-time given number ...
Dune namespace.
Definition: alignedallocator.hh:13
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