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EpetraExt_BlockMultiVector.cpp
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00004 //     EpetraExt: Epetra Extended - Linear Algebra Services Package
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00041 
00042 #include "EpetraExt_BlockMultiVector.h"
00043 #include "EpetraExt_BlockUtility.h"
00044 #include "Epetra_Map.h"
00045 
00046 using std::vector;
00047 
00048 namespace EpetraExt {
00049 
00050 //=============================================================================
00051 // EpetraExt::BlockMultiVector Constructor
00052 BlockMultiVector::BlockMultiVector(
00053       const Epetra_BlockMap & BaseMap,
00054       const Epetra_BlockMap & GlobalMap,
00055       int NumVectors )
00056   : Epetra_MultiVector( GlobalMap, NumVectors ),
00057     BaseMap_( BaseMap ),
00058     Offset_( BlockUtility::CalculateOffset64( BaseMap ) )
00059 {
00060 }
00061 
00062 //=============================================================================
00063 // EpetraExt::BlockMultiVector Constructor
00064 BlockMultiVector::BlockMultiVector(
00065       Epetra_DataAccess CV, 
00066       const Epetra_BlockMap & BaseMap, 
00067       const Epetra_MultiVector & BlockVec)
00068   : Epetra_MultiVector( CV, BlockVec, 0, BlockVec.NumVectors() ),
00069     BaseMap_( BaseMap ),
00070     Offset_( BlockUtility::CalculateOffset64( BaseMap ) )
00071 {
00072 }
00073 
00074 //==========================================================================
00075 // Copy Constructor
00076 BlockMultiVector::BlockMultiVector(const BlockMultiVector& Source)
00077   : Epetra_MultiVector( dynamic_cast<const Epetra_MultiVector &>(Source) ),
00078     BaseMap_( Source.BaseMap_ ),
00079     Offset_( Source.Offset_ )
00080 {
00081 }
00082 
00083 //=========================================================================
00084 BlockMultiVector::~BlockMultiVector()
00085 {
00086 }
00087 
00088 //=========================================================================
00089 int BlockMultiVector::ExtractBlockValues(Epetra_MultiVector & BaseVector, long long GlobalBlockRow) const
00090 {
00091    long long IndexOffset = GlobalBlockRow * Offset_;
00092    int localIndex=0;
00093 
00094    // For each entry in the base vector, translate its global ID
00095    // by the IndexOffset and extract the value from this blockVector
00096    for (int i=0; i<BaseMap_.NumMyElements(); i++) {
00097       localIndex = this->Map().LID((IndexOffset + BaseMap_.GID64(i)));
00098       if (localIndex==-1) { 
00099        std::cout << "Error in  BlockMultiVector::GetBlock: " << i << " " 
00100       << IndexOffset << " " << BaseMap_.GID64(i) << std::endl;
00101        return -1;
00102       }
00103       for (int j=0; j<NumVectors(); j++)
00104   BaseVector[j][i] = (*this)[j][localIndex]; 
00105    }
00106 
00107    return 0;
00108 }
00109 
00110 //=========================================================================
00111 int BlockMultiVector::LoadBlockValues(const Epetra_MultiVector & BaseVector, long long GlobalBlockRow) 
00112 {
00113    long long IndexOffset = GlobalBlockRow * Offset_;
00114    int localIndex=0;
00115 
00116    // For each entry in the base vector, translate its global ID
00117    // by the IndexOffset and load into this blockVector
00118    for (int i=0; i<BaseMap_.NumMyElements(); i++) {
00119       localIndex = this->Map().LID((IndexOffset + BaseMap_.GID64(i)));
00120       if (localIndex==-1) { 
00121        std::cout << "Error in  BlockMultiVector::GetBlock: " << i << " " 
00122       << IndexOffset << " " << BaseMap_.GID64(i) << std::endl;
00123        return -1;
00124       }
00125       for (int j=0; j<NumVectors(); j++)
00126   (*this)[j][localIndex] = BaseVector[j][i];
00127    }
00128 
00129    return 0;
00130 }
00131 
00132 //=========================================================================
00133 Teuchos::RCP<const Epetra_MultiVector>
00134 BlockMultiVector::GetBlock(long long GlobalBlockRow) const
00135 {
00136   long long offset = GlobalBlockRow * BaseMap_.NumMyElements();
00137   int numVecs = NumVectors();
00138   double **pointers = Pointers();
00139   double **block_pointers = new double*[numVecs];
00140   for (int i=0; i<numVecs; i++)
00141     block_pointers[i] = pointers[i]+offset;
00142   Teuchos::RCP<Epetra_MultiVector> block = 
00143     Teuchos::rcp(new Epetra_MultiVector(View, BaseMap_, block_pointers,
00144           numVecs));
00145   delete [] block_pointers;
00146   return block;
00147 }
00148 
00149 //=========================================================================
00150 Teuchos::RCP<Epetra_MultiVector>
00151 BlockMultiVector::GetBlock(long long GlobalBlockRow)
00152 {
00153   long long offset = GlobalBlockRow * BaseMap_.NumMyElements();
00154   int numVecs = NumVectors();
00155   double **pointers = Pointers();
00156   double **block_pointers = new double*[numVecs];
00157   for (int i=0; i<numVecs; i++)
00158     block_pointers[i] = pointers[i]+offset;
00159   Teuchos::RCP<Epetra_MultiVector> block = 
00160     Teuchos::rcp(new Epetra_MultiVector(View, BaseMap_, block_pointers,
00161           numVecs));
00162   delete [] block_pointers;
00163   return block;
00164 }
00165 
00166 //=========================================================================
00167 const Epetra_BlockMap&
00168 BlockMultiVector::GetBaseMap() const
00169 {
00170   return BaseMap_;
00171 }
00172 
00173 } //namespace EpetraExt
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