EpetraExt_BlockMultiVector.cpp

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// 
//               EpetraExt: Extended Linear Algebra Services Package 
//                 Copyright (2001) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
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// This library is free software; you can redistribute it and/or modify
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// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
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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 NumVectors )
  : Epetra_MultiVector( GlobalMap, NumVectors ),
    BaseMap_( BaseMap ),
    Offset_( BlockUtility::CalculateOffset( 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::CalculateOffset( 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, int GlobalBlockRow) const
{
   int 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_.GID(i)));
      if (localIndex==-1) { 
       cout << "Error in  BlockMultiVector::GetBlock: " << i << " " 
      << IndexOffset << " " << BaseMap_.GID(i) << 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, int GlobalBlockRow) 
{
   int 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_.GID(i)));
      if (localIndex==-1) { 
       cout << "Error in  BlockMultiVector::GetBlock: " << i << " " 
      << IndexOffset << " " << BaseMap_.GID(i) << 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(int GlobalBlockRow) const
{
  int 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(int GlobalBlockRow)
{
  int 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