fei_Trilinos_Helpers.hpp

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#ifndef _fei_Trilinos_Helpers_hpp_
#define _fei_Trilinos_Helpers_hpp_

#include "fei_trilinos_macros.hpp"
#include "fei_fwd.hpp"

#include <fei_Include_Trilinos.hpp>

#include <fei_mpi.h>
#include <fei_SharedPtr.hpp>

#include <fei_LinearProblemManager.hpp>
#include <fei_VectorSpace.hpp>
#include <fei_Reducer.hpp>
#include <fei_MatrixGraph.hpp>

namespace Trilinos_Helpers {

#ifdef HAVE_FEI_EPETRA

  Epetra_Map create_Epetra_Map(MPI_Comm comm,
                               const std::vector<int>& local_eqns);

  Epetra_BlockMap
    create_Epetra_BlockMap(const fei::SharedPtr<fei::VectorSpace>& vecspace);

  Epetra_CrsGraph
    create_Epetra_CrsGraph(const fei::SharedPtr<fei::MatrixGraph>& matgraph,
                           bool blockEntries,
                           bool orderRowsWithLocalColsFirst=false);

  fei::SharedPtr<fei::Matrix>
    create_from_Epetra_Matrix(fei::SharedPtr<fei::MatrixGraph> matrixGraph,
                              bool blockEntryMatrix,
                              fei::SharedPtr<fei::Reducer> reducer,
                              bool orderRowsWithLocalColsFirst=false);

  fei::SharedPtr<fei::Matrix>
    create_from_LPM_EpetraBasic(fei::SharedPtr<fei::MatrixGraph> matrixGraph,
                                 bool blockEntryMatrix,
                                 fei::SharedPtr<fei::Reducer> reducer,
                                 fei::SharedPtr<fei::LinearProblemManager>
                                   lpm_epetrabasic);
#endif

  void copy_parameterset(const fei::ParameterSet& paramset,
                         Teuchos::ParameterList& paramlist);

  void copy_parameterlist(const Teuchos::ParameterList& paramlist,
                          fei::ParameterSet& paramset);

#ifdef HAVE_FEI_EPETRA

  Epetra_MultiVector*
    get_Epetra_MultiVector(fei::Vector* feivec, bool soln_vec);

  Epetra_VbrMatrix* get_Epetra_VbrMatrix(fei::Matrix* feimat);

  Epetra_CrsMatrix* get_Epetra_CrsMatrix(fei::Matrix* feimat);

  void get_Epetra_pointers(fei::SharedPtr<fei::Matrix> feiA,
                           fei::SharedPtr<fei::Vector> feix,
                           fei::SharedPtr<fei::Vector> feib,
                           Epetra_CrsMatrix*& crsA,
                           Epetra_Operator*& opA,
                           Epetra_MultiVector*& x,
                           Epetra_MultiVector*& b);

  int zero_Epetra_VbrMatrix(Epetra_VbrMatrix* mat);

  inline
  double* getBeginPointer(const fei::SharedPtr<fei::Matrix>& feiA)
  {
    Epetra_CrsMatrix* A = get_Epetra_CrsMatrix(feiA.get());
    return (*A)[0];
  }

  inline
  int getOffsetG(const fei::SharedPtr<fei::Matrix>& feiA,
                 int global_row_index, int global_col_index)
  {
    Epetra_CrsMatrix* A = get_Epetra_CrsMatrix(feiA.get());
    const Epetra_Map& erowmap = A->RowMap();
    const Epetra_Map& ecolmap = A->ColMap();
    int local_row = erowmap.LID(global_row_index);
    int local_col = ecolmap.LID(global_col_index);
  
    int* rowOffsets;
    int* colIndices;
    double* coefs;
    A->ExtractCrsDataPointers(rowOffsets, colIndices, coefs);
  
    int* row_ptr = &colIndices[rowOffsets[local_row]];
    int* end_row = &colIndices[rowOffsets[local_row+1]];
  
    int col_offset = 0;
    for(; row_ptr != end_row; ++row_ptr) {
      if (*row_ptr == local_col) break;
      ++col_offset;
    }
  
    return rowOffsets[local_row] + col_offset;
  }

  inline
  int getOffsetL(const fei::SharedPtr<fei::Matrix>& feiA,
                 int local_row_index, int local_col_index)
  {
    Epetra_CrsMatrix* A = get_Epetra_CrsMatrix(feiA.get());
  
    int* rowOffsets;
    int* colIndices;
    double* coefs;
    A->ExtractCrsDataPointers(rowOffsets, colIndices, coefs);
  
    int* row_ptr = &colIndices[rowOffsets[local_row_index]];
    int* end_row = &colIndices[rowOffsets[local_row_index+1]];
  
    int col_offset = 0;
    for(; row_ptr != end_row; ++row_ptr) {
      if (*row_ptr == local_col_index) break;
      ++col_offset;
    }
  
    return rowOffsets[local_row_index] + col_offset;
  }

#endif // HAVE_FEI_EPETRA

}//namespace Trilinos_Helpers

#endif // _Trilinos_Helpers_hpp_