libtrilinos-galeri-dev 12.10.1-3 / usr / include / trilinos / Galeri_Cross2D.h

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#ifndef GALERI_CROSS2D_H
#define GALERI_CROSS2D_H

#include "Galeri_Exception.h"
#include "Galeri_Utils.h"
#include "Epetra_Comm.h"
#include "Epetra_BlockMap.h"
#include "Epetra_Vector.h"
#include "Epetra_CrsMatrix.h"

namespace Galeri {
namespace Matrices {

template<typename int_type>
inline
Epetra_CrsMatrix* 
Cross2D(const Epetra_Map* Map, const int nx, const int ny,
        const double a, const double b, const double c, 
        const double d, const double e)
{
  Epetra_CrsMatrix* Matrix = new Epetra_CrsMatrix(Copy, *Map,  5);

  int NumMyElements = Map->NumMyElements();
  int_type* MyGlobalElements = 0;
  Map->MyGlobalElementsPtr(MyGlobalElements);

  int left, right, lower, upper;
  std::vector<double> Values(4);
  std::vector<int_type> Indices(4);

  //    e
  //  b a c
  //    d
  for (int i = 0 ; i < NumMyElements ; ++i) 
  {
    int NumEntries = 0;
    GetNeighboursCartesian2d(MyGlobalElements[i], nx, ny, 
			     left, right, lower, upper);

    if (left != -1) 
    {
      Indices[NumEntries] = left;
      Values[NumEntries] = b;
      ++NumEntries;
    }
    if (right != -1) 
    {
      Indices[NumEntries] = right;
      Values[NumEntries] = c;
      ++NumEntries;
    }
    if (lower != -1) 
    {
      Indices[NumEntries] = lower;
      Values[NumEntries] = d;
      ++NumEntries;
    }
    if (upper != -1) 
    {
      Indices[NumEntries] = upper;
      Values[NumEntries] = e;
      ++NumEntries;
    }
    // put the off-diagonal entries
    Matrix->InsertGlobalValues(MyGlobalElements[i], NumEntries, 
                               &Values[0], &Indices[0]);

    // Put in the diagonal entry
    double diag = a;
	
    Matrix->InsertGlobalValues(MyGlobalElements[i], 1, 
                               &diag, MyGlobalElements + i);
  }
  Matrix->FillComplete();
  Matrix->OptimizeStorage();

  return(Matrix);
}

template<typename int_type>
Epetra_CrsMatrix* 
Cross2D(const Epetra_Map* Map, const int nx, const int ny,
        const Epetra_Vector& A, const Epetra_Vector& B, const Epetra_Vector& C,
        const Epetra_Vector& D, const Epetra_Vector& E)
{
  Epetra_CrsMatrix* Matrix = new Epetra_CrsMatrix(Copy, *Map,  5);

  int NumMyElements = Map->NumMyElements();
  int_type* MyGlobalElements = 0;
  Map->MyGlobalElementsPtr(MyGlobalElements);

  int left, right, lower, upper;
  double Values[5];
  int_type Indices[5];
    
  for (int i = 0 ; i < NumMyElements ; ++i) 
  {
    int NumEntries = 0;
    GetNeighboursCartesian2d(MyGlobalElements[i], nx, ny, 
			     left, right, lower, upper);

    if (left != -1) 
    {
      Indices[NumEntries] = left;
      Values[NumEntries] = B[i];
      ++NumEntries;
    }
    if (right != -1) 
    {
      Indices[NumEntries] = right;
      Values[NumEntries] = C[i];
      ++NumEntries;
    }
    if (lower != -1) 
    {
      Indices[NumEntries] = lower;
      Values[NumEntries] = D[i];
      ++NumEntries;
    }
    if (upper != -1) 
    {
      Indices[NumEntries] = upper;
      Values[NumEntries] = E[i];
      ++NumEntries;
    }

    Indices[NumEntries] = MyGlobalElements[i];
    Values[NumEntries] = A[i];
    ++NumEntries;

    Matrix->InsertGlobalValues(MyGlobalElements[i], NumEntries, 
                               Values, Indices);
  }

  Matrix->FillComplete();
  Matrix->OptimizeStorage();

  return(Matrix);
}

inline
Epetra_CrsMatrix* 
Cross2D(const Epetra_Map* Map, const int nx, const int ny,
        const double a, const double b, const double c, 
        const double d, const double e)
{
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
  if(Map->GlobalIndicesInt()) {
	  return Cross2D<int>(Map, nx, ny, a, b, c, d, e);
  }
  else
#endif
#ifndef EPETRA_NO_64BIT_GLOBAL_INDICES
  if(Map->GlobalIndicesLongLong()) {
	  return Cross2D<long long>(Map, nx, ny, a, b, c, d, e);
  }
  else
#endif
    throw "Galeri::Matrices::Cross2D: GlobalIndices type unknown";
}

inline
Epetra_CrsMatrix* 
Cross2D(const Epetra_Map* Map, const int nx, const int ny,
        const Epetra_Vector& A, const Epetra_Vector& B, const Epetra_Vector& C,
        const Epetra_Vector& D, const Epetra_Vector& E)
{
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
  if(Map->GlobalIndicesInt()) {
	  return Cross2D<int>(Map, nx, ny, A, B, C, D, E);

  }
  else
#endif
#ifndef EPETRA_NO_64BIT_GLOBAL_INDICES
  if(Map->GlobalIndicesLongLong()) {
	  return Cross2D<long long>(Map, nx, ny, A, B, C, D, E);
  }
  else
#endif
    throw "Galeri::Matrices::Cross2D: GlobalIndices type unknown";
}

} // namespace Matrices
} // namespace Galeri
#endif