C++ RefCountPtr::ExtractMyRowCopy方法代码示例

//==========================================================================
int Ifpack_CrsIct::InitValues(const Epetra_CrsMatrix & A) {

  int ierr = 0;
  int i, j;
  int NumIn, NumL, NumU;
  bool DiagFound;
  int NumNonzeroDiags = 0;

  Teuchos::RefCountPtr<Epetra_CrsMatrix> OverlapA = Teuchos::rcp( (Epetra_CrsMatrix *) &A_ , false );

  if (LevelOverlap_>0) {
    EPETRA_CHK_ERR(-1); // Not implemented yet
    //OverlapA = new Epetra_CrsMatrix(Copy, *Graph_.OverlapGraph());
    //EPETRA_CHK_ERR(OverlapA->Import(A, *Graph_.OverlapImporter(), Insert));
    //EPETRA_CHK_ERR(OverlapA->FillComplete());
  }
  // Get Maximun Row length
  int MaxNumEntries = OverlapA->MaxNumEntries();

  vector<int> InI(MaxNumEntries); // Allocate temp space
  vector<int> UI(MaxNumEntries);
  vector<double> InV(MaxNumEntries);
  vector<double> UV(MaxNumEntries);

  double *DV;
  ierr = D_->ExtractView(&DV); // Get view of diagonal
    

  // First we copy the user's matrix into diagonal vector and U, regardless of fill level

  int NumRows = OverlapA->NumMyRows();

  for (i=0; i< NumRows; i++) {

    OverlapA->ExtractMyRowCopy(i, MaxNumEntries, NumIn, &InV[0], &InI[0]); // Get Values and Indices
    
    // Split into L and U (we don't assume that indices are ordered).
    
    NumL = 0; 
    NumU = 0; 
    DiagFound = false;
    
    for (j=0; j< NumIn; j++) {
      int k = InI[j];

      if (k==i) {
	DiagFound = true;
	DV[i] += Rthresh_ * InV[j] + EPETRA_SGN(InV[j]) * Athresh_; // Store perturbed diagonal in Epetra_Vector D_
      }

      else if (k < 0) return(-1); // Out of range
      else if (i<k && k<NumRows) {
	UI[NumU] = k;
	UV[NumU] = InV[j];
	NumU++;
      }
    }
    
    // Check in things for this row of L and U

    if (DiagFound) NumNonzeroDiags++;
    if (NumU) U_->InsertMyValues(i, NumU, &UV[0], &UI[0]);
    
  }

  U_->FillComplete(A_.OperatorDomainMap(), A_.OperatorRangeMap());
  SetValuesInitialized(true);
  SetFactored(false);

  int ierr1 = 0;
  if (NumNonzeroDiags<U_->NumMyRows()) ierr1 = 1;
  A_.Comm().MaxAll(&ierr1, &ierr, 1);
  EPETRA_CHK_ERR(ierr);
  return(0);
}

//==============================================================================
// NOTE:
// - matrix is supposed to be localized, and passes through the
// singleton filter. This means that I do not have to look
// for Dirichlet nodes (singletons). Also, all rows and columns are 
// local.
int Ifpack_METISPartitioner::ComputePartitions()
{

  int ierr;
#ifdef HAVE_IFPACK_METIS
  int nbytes = 0;
  int edgecut;
#endif

  Teuchos::RefCountPtr<Epetra_CrsGraph> SymGraph ;
  Teuchos::RefCountPtr<Epetra_Map> SymMap;
  Teuchos::RefCountPtr<Ifpack_Graph_Epetra_CrsGraph> SymIFPACKGraph;
  Teuchos::RefCountPtr<Ifpack_Graph> IFPACKGraph = Teuchos::rcp( (Ifpack_Graph*)Graph_, false );

  int Length = 2 * MaxNumEntries();
  int NumIndices;
  std::vector<int> Indices;
  Indices.resize(Length);

  /* construct the CSR graph information of the LOCAL matrix
     using the get_row function */

  std::vector<idxtype> wgtflag;
  wgtflag.resize(4);

  std::vector<int> options;
  options.resize(4);
  
  int numflag;

  if (UseSymmetricGraph_) {

#if !defined(EPETRA_NO_32BIT_GLOBAL_INDICES) || !defined(EPETRA_NO_64BIT_GLOBAL_INDICES)
    // need to build a symmetric graph. 
    // I do this in two stages:
    // 1.- construct an Epetra_CrsMatrix, symmetric
    // 2.- convert the Epetra_CrsMatrix into METIS format
    SymMap = Teuchos::rcp( new Epetra_Map(NumMyRows(),0,Graph_->Comm()) );
    SymGraph = Teuchos::rcp( new Epetra_CrsGraph(Copy,*SymMap,0) );
#endif

#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
      if(SymGraph->RowMap().GlobalIndicesInt()) {
        for (int i = 0; i < NumMyRows() ; ++i) {

          ierr = Graph_->ExtractMyRowCopy(i, Length, NumIndices, &Indices[0]);
          IFPACK_CHK_ERR(ierr);

          for (int j = 0 ; j < NumIndices ; ++j) {
            int jj = Indices[j];
            if (jj != i) {
              SymGraph->InsertGlobalIndices(i,1,&jj);
              SymGraph->InsertGlobalIndices(jj,1,&i);
            }
          }
        }
      }
      else
#endif
#ifndef EPETRA_NO_64BIT_GLOBAL_INDICES
      if(SymGraph->RowMap().GlobalIndicesLongLong()) {
        for (int i = 0; i < NumMyRows() ; ++i) {
          long long i_LL = i;

          ierr = Graph_->ExtractMyRowCopy(i, Length, NumIndices, &Indices[0]);
          IFPACK_CHK_ERR(ierr);

          for (int j = 0 ; j < NumIndices ; ++j) {
            long long jj = Indices[j];
            if (jj != i_LL) {
              SymGraph->InsertGlobalIndices(i_LL,1,&jj);
              SymGraph->InsertGlobalIndices(jj,1,&i_LL);
            }
          }
        }
      }
      else
#endif
        throw "Ifpack_METISPartitioner::ComputePartitions: GlobalIndices type unknown";

    IFPACK_CHK_ERR(SymGraph->FillComplete());
    SymIFPACKGraph = Teuchos::rcp( new Ifpack_Graph_Epetra_CrsGraph(SymGraph) );
    IFPACKGraph = SymIFPACKGraph;
  }

  // now work on IFPACKGraph, that can be the symmetric or
  // the non-symmetric one

  /* set parameters */
   
  wgtflag[0] = 0;    /* no weights */
  numflag    = 0;    /* C style */
  options[0] = 0;    /* default options */
   
//.........这里部分代码省略.........