temporarylocalmatrix.hh

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#ifndef DUNE_FEM_TEMPORARYLOCALMATRIX_HH
#define DUNE_FEM_TEMPORARYLOCALMATRIX_HH
 
#include <algorithm>
#include <vector>
 
#include <dune/common/densematrix.hh>
#include <dune/common/dynvector.hh>
 
#include <dune/fem/operator/common/localmatrix.hh>
#include <dune/fem/storage/rowreferencevector.hh>
 
namespace Dune
{
 
  namespace Fem
  {
 
    // Internal Forward Declarations
    // -----------------------------
 
    template< class DomainSpaceImp, class RangeSpaceImp >
    class TemporaryLocalMatrix;
 
 
 
    // TemporaryLocalMatrixTraits
    // --------------------------
 
    template< class DomainSpaceImp, class RangeSpaceImp >
    struct TemporaryLocalMatrixTraits
    {
      typedef DomainSpaceImp DomainSpaceType;
      typedef RangeSpaceImp RangeSpaceType;
 
      typedef TemporaryLocalMatrix< DomainSpaceType, RangeSpaceType >
        LocalMatrixType;
 
      typedef typename DomainSpaceType :: RangeFieldType DomainFieldType;
      typedef typename RangeSpaceType :: RangeFieldType RangeFieldType;
      typedef RangeFieldType LittleBlockType;
    };
 
  } // namespace Fem
 
 
 
  // DenseMatVecTraits for TemporaryLocalMatrix
  // ------------------------------------------
 
  template< class DomainSpaceImp, class RangeSpaceImp >
  struct DenseMatVecTraits< Fem::TemporaryLocalMatrix< DomainSpaceImp, RangeSpaceImp > >
  {
    typedef Fem::TemporaryLocalMatrix< DomainSpaceImp, RangeSpaceImp > derived_type;
 
    typedef typename Fem::TemporaryLocalMatrixTraits< DomainSpaceImp, RangeSpaceImp >::RangeFieldType value_type;
    typedef int size_type;
 
    typedef DynamicVector< value_type > row_type;
 
    typedef Fem::RowReferenceVector< value_type > row_reference;
    typedef Fem::RowReferenceVector< const value_type > const_row_reference;
  };
 
 
 
  // FieldTraits for TemporaryLocalMatrix
  // ------------------------------------
 
  template< class DomainSpaceImp, class RangeSpaceImp >
  struct FieldTraits< Fem::TemporaryLocalMatrix< DomainSpaceImp, RangeSpaceImp > >
    : public FieldTraits< typename Fem::TemporaryLocalMatrixTraits< DomainSpaceImp, RangeSpaceImp >::RangeFieldType >
  {};
 
 
 
  namespace Fem
  {
 
    // TemporaryLocalMatrix
    // --------------------
 
    template< class DomainSpaceImp, class RangeSpaceImp >
    class TemporaryLocalMatrix
      : public DenseMatrix< TemporaryLocalMatrix< DomainSpaceImp, RangeSpaceImp > >,
        public LocalMatrixDefault< TemporaryLocalMatrixTraits< DomainSpaceImp, RangeSpaceImp > >
    {
    public:
      typedef DomainSpaceImp DomainSpaceType;
      typedef RangeSpaceImp RangeSpaceType;
 
      typedef TemporaryLocalMatrixTraits< DomainSpaceType, RangeSpaceType >
        Traits;
 
    private:
      typedef TemporaryLocalMatrix< DomainSpaceType, RangeSpaceType >
        ThisType;
      typedef LocalMatrixDefault< Traits > BaseType;
 
    public:
      typedef typename Traits :: DomainFieldType DomainFieldType;
      typedef typename Traits :: RangeFieldType RangeFieldType;
 
      typedef int size_type;
      typedef RangeFieldType value_type;
 
      typedef RowReferenceVector< value_type > row_reference;
      typedef RowReferenceVector< const value_type > const_row_reference;
 
      typedef std::vector< RangeFieldType > MatrixEntriesType;
    protected:
      MatrixEntriesType fields_;
 
    public:
      using BaseType::domainBasisFunctionSet;
      using BaseType::rangeBasisFunctionSet;
 
      inline TemporaryLocalMatrix ( const DomainSpaceType &domainSpace,
                                    const RangeSpaceType &rangeSpace )
      : BaseType( domainSpace, rangeSpace ),
        fields_()
      {}
 
      template< class DomainEntityType, class RangeEntityType >
      inline TemporaryLocalMatrix ( const DomainSpaceType &domainSpace,
                                    const RangeSpaceType &rangeSpace,
                                    const DomainEntityType &domainEntity,
                                    const RangeEntityType &rangeEntity )
      : BaseType( domainSpace, rangeSpace, domainEntity, rangeEntity ),
        fields_( rows() * columns() )
      {}
 
      template< class DomainEntityType, class RangeEntityType >
      inline void init ( const DomainEntityType &domainEntity,
                         const RangeEntityType &rangeEntity )
      {
        bind( domainEntity, rangeEntity );
      }
 
      template< class DomainEntityType, class RangeEntityType >
      inline void bind ( const DomainEntityType &domainEntity,
                         const RangeEntityType &rangeEntity )
      {
        BaseType :: bind( domainEntity, rangeEntity );
        fields_.resize( rows() * columns() );
      }
 
      inline void unbind ()
      {
        BaseType::unbind();
      }
 
      inline void add ( const int localRow,
                        const int localCol,
                        const RangeFieldType &value )
      {
        assert( (localRow >= 0) && (localRow < rows()) );
        assert( (localCol >= 0) && (localCol < columns()) );
        fields_[ localRow * columns() + localCol ] += value;
      }
 
      inline void set ( const int localRow,
                        const int localCol,
                        const RangeFieldType &value )
      {
        assert( (localRow >= 0) && (localRow < rows()) );
        assert( (localCol >= 0) && (localCol < columns()) );
        fields_[ localRow * columns() + localCol ] = value;
      }
 
      inline const RangeFieldType get ( const int localRow,
                                        const int localCol ) const
      {
        assert( (localRow >= 0) && (localRow < rows()) );
        assert( (localCol >= 0) && (localCol < columns()) );
        return fields_[ localRow * columns() + localCol ];
      }
 
      inline void scale( const RangeFieldType &value )
      {
        const std::size_t size = fields_.size();
        for( std::size_t i=0; i<size; ++i )
        {
          fields_[ i ] *= value;
        }
      }
 
      inline void clear ()
      {
        std::fill( fields_.begin() , fields_.end() , 0 );
      }
 
      void clearRow( const int localRow )
      {
        const int col = columns();
        auto start = fields_.begin() + localRow * col;
        auto end   = start + col;
        std::fill( start, end, 0 );
      }
 
      size_type rows () const { return mat_rows(); }
      size_type cols () const { return mat_cols(); }
      size_type columns () const { return mat_cols(); }
 
      // make this thing a dense matrix
      size_type mat_rows () const { return rangeBasisFunctionSet().size(); }
      size_type mat_cols () const { return domainBasisFunctionSet().size(); }
 
      row_reference mat_access ( size_type i )
      {
        const size_type cols = mat_cols();
        return row_reference( fields_.data() + i*cols, cols );
      }
 
      const_row_reference mat_access ( size_type i ) const
      {
        const size_type cols = mat_cols();
        return const_row_reference( fields_.data() + i*cols, cols );
      }
 
      // return pointer to data array for PetscLinearOperator to avoid copying.
      const RangeFieldType* data() const { return fields_.data(); }
 
      void print( std::ostream& out ) const
      {
        out << "TLM ("<<rows ()<<","<<cols()<<"):"<<std::endl;
        for( size_type r = 0; r<rows(); ++r )
        {
          for( size_type c = 0; c<cols(); ++c )
          {
            out << get( r , c ) << " ";
          }
          out << std::endl;
        }
        out << std::endl << std::endl;
      }
 
    };
 
  } // namespace Fem
 
} // namespace Dune
 
#endif // #ifndef DUNE_FEM_TEMPORARYLOCALMATRIX_HH