MGTransferBlock< number > Class Template Reference
[Multilevel support]

Inheritance diagram for MGTransferBlock< number >:

Inheritance graph
[legend]

List of all members.

Public Member Functions

 MGTransferBlock ()
virtual ~MGTransferBlock ()
void initialize (const std::vector< number > &factors, VectorMemory< Vector< number > > &memory)
template<int dim, int spacedim>
void build_matrices (const DoFHandler< dim, spacedim > &dof, const MGDoFHandler< dim, spacedim > &mg_dof, const std::vector< bool > &selected)
virtual void prolongate (const unsigned int to_level, BlockVector< number > &dst, const BlockVector< number > &src) const
virtual void restrict_and_add (const unsigned int from_level, BlockVector< number > &dst, const BlockVector< number > &src) const
template<int dim, typename number2 , int spacedim>
void copy_to_mg (const MGDoFHandler< dim, spacedim > &mg_dof, MGLevelObject< BlockVector< number > > &dst, const BlockVector< number2 > &src) const
template<int dim, typename number2 , int spacedim>
void copy_from_mg (const MGDoFHandler< dim, spacedim > &mg_dof, BlockVector< number2 > &dst, const MGLevelObject< BlockVector< number > > &src) const
template<int dim, typename number2 , int spacedim>
void copy_from_mg_add (const MGDoFHandler< dim, spacedim > &mg_dof, BlockVector< number2 > &dst, const MGLevelObject< BlockVector< number > > &src) const

Private Attributes

std::vector< number > factors
SmartPointer< VectorMemory
< Vector< number > > > 
memory


Detailed Description

template<typename number>
class MGTransferBlock< number >

Implementation of the MGTransferBase interface for block matrices and block vectors.

Warning:
This class is in an untested state. If you use it and you encounter problems, please contact Guido Kanschat.
In addition to the functionality of MGTransferPrebuilt, the operation may be restricted to certain blocks of the vector.

If the restricted mode is chosen, block vectors used in the transfer routines may only have as many blocks as there are trues in the selected-field.

See MGTransferBase to find out which of the transfer classes is best for your needs.

Author:
Guido Kanschat, 2001, 2002

Constructor & Destructor Documentation

template<typename number >
MGTransferBlock< number >::MGTransferBlock (  ) 

Default constructor.

template<typename number >
virtual MGTransferBlock< number >::~MGTransferBlock (  )  [virtual]

Destructor.


Member Function Documentation

template<typename number >
void MGTransferBlock< number >::initialize ( const std::vector< number > &  factors,
VectorMemory< Vector< number > > &  memory 
)

Initialize additional factors and memory if the restriction of the blocks is to be weighted differently.

template<typename number >
template<int dim, int spacedim>
void MGTransferBlock< number >::build_matrices ( const DoFHandler< dim, spacedim > &  dof,
const MGDoFHandler< dim, spacedim > &  mg_dof,
const std::vector< bool > &  selected 
) [inline]

Build the prolongation matrices for each level.

This function is a front-end for the same function in MGTransferBlockBase.

template<typename number >
virtual void MGTransferBlock< number >::prolongate ( const unsigned int  to_level,
BlockVector< number > &  dst,
const BlockVector< number > &  src 
) const [virtual]

Prolongate a vector from level to_level-1 to level to_level. The previous content of dst is overwritten.

  • src is a vector with as many elements as there are degrees of freedom on the coarser level involved.
  • dst has as many elements as there are degrees of freedom on the finer level.

Implements MGTransferBase< BlockVector< number > >.

template<typename number >
virtual void MGTransferBlock< number >::restrict_and_add ( const unsigned int  from_level,
BlockVector< number > &  dst,
const BlockVector< number > &  src 
) const [virtual]

Restrict a vector from level from_level to level from_level-1 and add this restriction to dst. If the region covered by cells on level from_level is smaller than that of level from_level-1 (local refinement), then some degrees of freedom in dst are active and will not be altered. For the other degress of freedom, the result of the restriction is added.

  • src is a vector with as many elements as there are degrees of freedom on the finer level
  • dst has as many elements as there are degrees of freedom on the coarser level.

Implements MGTransferBase< BlockVector< number > >.

template<typename number >
template<int dim, typename number2 , int spacedim>
void MGTransferBlock< number >::copy_to_mg ( const MGDoFHandler< dim, spacedim > &  mg_dof,
MGLevelObject< BlockVector< number > > &  dst,
const BlockVector< number2 > &  src 
) const [inline]

Transfer from a vector on the global grid to a multilevel vector.

The action for discontinuous elements is as follows: on an active mesh cell, the global vector entries are simply copied to the corresponding entries of the level vector. Then, these values are restricted down to the coarsest level.

template<typename number >
template<int dim, typename number2 , int spacedim>
void MGTransferBlock< number >::copy_from_mg ( const MGDoFHandler< dim, spacedim > &  mg_dof,
BlockVector< number2 > &  dst,
const MGLevelObject< BlockVector< number > > &  src 
) const [inline]

Transfer from multi-level vector to normal vector.

Copies data from active portions of a multilevel vector into the respective positions of a global vector.

template<typename number >
template<int dim, typename number2 , int spacedim>
void MGTransferBlock< number >::copy_from_mg_add ( const MGDoFHandler< dim, spacedim > &  mg_dof,
BlockVector< number2 > &  dst,
const MGLevelObject< BlockVector< number > > &  src 
) const [inline]

Add a multi-level vector to a normal vector.

Works as the previous function, but probably not for continuous elements.


Member Data Documentation

template<typename number >
std::vector<number> MGTransferBlock< number >::factors [private]

Optional multiplication factors for each block. Requires initialization of memory.

template<typename number >
SmartPointer<VectorMemory<Vector<number> > > MGTransferBlock< number >::memory [private]

Memory pool required if additional multiplication using factors is desired.


The documentation for this class was generated from the following file:

deal.II documentation generated on Sat Aug 15 16:52:09 2009 by doxygen 1.5.9