EpetraExt_BlockMultiVector.cpp

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//     EpetraExt: Epetra Extended - Linear Algebra Services Package
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#include "EpetraExt_BlockMultiVector.h"
#include "EpetraExt_BlockUtility.h"
#include "Epetra_Map.h"

using std::vector;

namespace EpetraExt {

//=============================================================================
// EpetraExt::BlockMultiVector Constructor
BlockMultiVector::BlockMultiVector(
      const Epetra_BlockMap & BaseMap,
      const Epetra_BlockMap & GlobalMap,
      int numVecs )
  : Epetra_MultiVector( GlobalMap, numVecs ),
    BaseMap_( BaseMap ),
    Offset_( BlockUtility::CalculateOffset64( BaseMap ) )
{
}

//=============================================================================
// EpetraExt::BlockMultiVector Constructor
BlockMultiVector::BlockMultiVector(
      Epetra_DataAccess CV,
      const Epetra_BlockMap & BaseMap,
      const Epetra_MultiVector & BlockVec)
  : Epetra_MultiVector( CV, BlockVec, 0, BlockVec.NumVectors() ),
    BaseMap_( BaseMap ),
    Offset_( BlockUtility::CalculateOffset64( BaseMap ) )
{
}

//==========================================================================
// Copy Constructor
BlockMultiVector::BlockMultiVector(const BlockMultiVector& Source)
  : Epetra_MultiVector( dynamic_cast<const Epetra_MultiVector &>(Source) ),
    BaseMap_( Source.BaseMap_ ),
    Offset_( Source.Offset_ )
{
}

//=========================================================================
BlockMultiVector::~BlockMultiVector()
{
}

//=========================================================================
int BlockMultiVector::ExtractBlockValues(Epetra_MultiVector & BaseVector, long long GlobalBlockRow) const
{
   long long IndexOffset = GlobalBlockRow * Offset_;
   int localIndex=0;

   // For each entry in the base vector, translate its global ID
   // by the IndexOffset and extract the value from this blockVector
   for (int i=0; i<BaseMap_.NumMyElements(); i++) {
      localIndex = this->Map().LID((IndexOffset + BaseMap_.GID64(i)));
      if (localIndex==-1) {
             std::cout << "Error in  BlockMultiVector::GetBlock: " << i << " "
                  << IndexOffset << " " << BaseMap_.GID64(i) << std::endl;
             return -1;
      }
      for (int j=0; j<NumVectors(); j++)
        BaseVector[j][i] = (*this)[j][localIndex];
   }

   return 0;
}

//=========================================================================
int BlockMultiVector::LoadBlockValues(const Epetra_MultiVector & BaseVector, long long GlobalBlockRow)
{
   long long IndexOffset = GlobalBlockRow * Offset_;
   int localIndex=0;

   // For each entry in the base vector, translate its global ID
   // by the IndexOffset and load into this blockVector
   for (int i=0; i<BaseMap_.NumMyElements(); i++) {
      localIndex = this->Map().LID((IndexOffset + BaseMap_.GID64(i)));
      if (localIndex==-1) {
             std::cout << "Error in  BlockMultiVector::GetBlock: " << i << " "
                  << IndexOffset << " " << BaseMap_.GID64(i) << std::endl;
             return -1;
      }
      for (int j=0; j<NumVectors(); j++)
        (*this)[j][localIndex] = BaseVector[j][i];
   }

   return 0;
}

//=========================================================================
Teuchos::RCP<const Epetra_MultiVector>
BlockMultiVector::GetBlock(long long GlobalBlockRow) const
{
  long long offset = GlobalBlockRow * BaseMap_.NumMyElements();
  int numVecs = NumVectors();
  double **pointers = Pointers();
  double **block_pointers = new double*[numVecs];
  for (int i=0; i<numVecs; i++)
    block_pointers[i] = pointers[i]+offset;
  Teuchos::RCP<Epetra_MultiVector> block =
    Teuchos::rcp(new Epetra_MultiVector(View, BaseMap_, block_pointers,
                                        numVecs));
  delete [] block_pointers;
  return block;
}

//=========================================================================
Teuchos::RCP<Epetra_MultiVector>
BlockMultiVector::GetBlock(long long GlobalBlockRow)
{
  long long offset = GlobalBlockRow * BaseMap_.NumMyElements();
  int numVecs = NumVectors();
  double **pointers = Pointers();
  double **block_pointers = new double*[numVecs];
  for (int i=0; i<numVecs; i++)
    block_pointers[i] = pointers[i]+offset;
  Teuchos::RCP<Epetra_MultiVector> block =
    Teuchos::rcp(new Epetra_MultiVector(View, BaseMap_, block_pointers,
                                        numVecs));
  delete [] block_pointers;
  return block;
}

//=========================================================================
const Epetra_BlockMap&
BlockMultiVector::GetBaseMap() const
{
  return BaseMap_;
}

} //namespace EpetraExt