EpetraExt_BlockVector.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
// it under the terms of the GNU Lesser General Public License as
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// Lesser General Public License for more details.
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// 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_BlockVector.h"
#include "EpetraExt_BlockUtility.h"
#include "Epetra_Map.h"
#include "Epetra_Comm.h"

namespace EpetraExt {

//=============================================================================
// EpetraExt::BlockVector Constructor
BlockVector::BlockVector(
      const Epetra_BlockMap & BaseMap,
      const Epetra_BlockMap & GlobalMap)
  : Epetra_Vector( GlobalMap ),
    BaseMap_( BaseMap ),
    Offset_( BlockUtility::CalculateOffset( BaseMap ) )
{
}

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

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

//=========================================================================
int BlockVector::ExtractBlockValues(Epetra_Vector & 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  BlockVector::GetBlock: " << i << " " 
      << IndexOffset << " " << BaseMap_.GID(i) << endl;
       return -1;
      }
      BaseVector[i] = Values_[localIndex]; 
   }

   return 0;
}

//=========================================================================
int BlockVector::LoadBlockValues(const Epetra_Vector & 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  BlockVector::GetBlock: " << i << " " 
      << IndexOffset << " " << BaseMap_.GID(i) << endl;
       return -1;
      }
      (*this)[localIndex] = BaseVector[i];
   }

   return 0;
}


} //namespace EpetraExt

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