Epetra_JadMatrix.h

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#ifndef EPETRA_JADMATRIX_H
#define EPETRA_JADMATRIX_H

#include "Epetra_BasicRowMatrix.h"
#include "Epetra_Map.h"
#include "Epetra_Comm.h"
#include "Epetra_SerialDenseVector.h"
#include "Epetra_IntSerialDenseVector.h"


class Epetra_Vector;
class Epetra_MultiVector;
class Epetra_Import;
class Epetra_Export;


class EPETRA_LIB_DLL_EXPORT Epetra_JadMatrix: public Epetra_BasicRowMatrix {

 public:


  /* The constructor for this class requires a fully constructed instance of an Epetra_RowMatrix
     object.
     \param Matrix (In) An existing Epetra_RowMatrix.
     \pre Matrix must have Matrix.Filled()==true.
  */
  Epetra_JadMatrix(const Epetra_RowMatrix & Matrix);

  virtual ~Epetra_JadMatrix();


  /* Updates the values only using a matrix that has exactly the same structure as
     the matrix used to construct this Epetra_JadMatrix object.  Once the constructor
     is called, the Matrix argument is no longer needed.
     \param Matrix (In) An existing Epetra_RowMatrix with \e identical structure to
            the matrix used to create this Epetra_JadMatrix.
     \param CheckStructure (In) Optional argument, by default is false.  If set to true,
            the method will check to see if the structure of Matrix is compatible with
      the structure of matrix used to create this Epetra_JadMatrix.  Performing
      this check has signficant overhead, so it should only be turned on for debugging.
     \pre Matrix must have Matrix.Filled()==true.
  */
  int UpdateValues(const Epetra_RowMatrix & Matrix, bool CheckStructure = false);




    int ExtractMyRowCopy(int MyRow, int Length, int & NumEntries, double *Values, int * Indices) const;


    int ExtractMyEntryView(int CurEntry, double * &Value, int & RowIndex, int & ColIndex) {
      if (CurEntry>=NumMyNonzeros_) EPETRA_CHK_ERR(-1);
      Value = &Values_[CurEntry];
      ColIndex = Indices_[CurEntry];
      for (int j=0; j<NumJaggedDiagonals_; j++) if (CurEntry<IndexOffset_[j+1]) {RowIndex = RowPerm_[CurEntry-IndexOffset_[j]]; break;}
      return(0);
    }


    int ExtractMyEntryView(int CurEntry, double const * & Value, int & RowIndex, int & ColIndex) const {
      if (CurEntry>=NumMyNonzeros_) EPETRA_CHK_ERR(-1);
      Value = &Values_[CurEntry];
      ColIndex = Indices_[CurEntry];
      for (int j=0; j<NumJaggedDiagonals_; j++) if (CurEntry<IndexOffset_[j+1]) {RowIndex = RowPerm_[CurEntry-IndexOffset_[j]]; break;}
      return(0);
    }


    int NumMyRowEntries(int MyRow, int & NumEntries) const;





    int Multiply(bool TransA, const Epetra_MultiVector& X, Epetra_MultiVector& Y) const;


    int Solve(bool Upper, bool Trans, bool UnitDiagonal,
              const Epetra_MultiVector& X,
              Epetra_MultiVector& Y) const
    {
      (void)Upper;
      (void)Trans;
      (void)UnitDiagonal;
      (void)X;
      (void)Y;
      return(-1);
    }



 protected:

  void GeneralMV(bool TransA, double * x, double * y) const;
  void GeneralMM(bool TransA, double ** X, int LDX, double ** Y, int LDY, int NumVectors) const;
  void GeneralMM3RHS(bool TransA, double ** X, int LDX, double ** Y, int LDY, int NumVectors) const;
  void GeneralMM2RHS(bool TransA, double * x, int ldx, double * y, int ldy) const;
  void Allocate(const Epetra_RowMatrix & Matrix);

  Epetra_SerialDenseVector Values_;
  Epetra_IntSerialDenseVector Indices_;
  Epetra_IntSerialDenseVector IndexOffset_;
  Epetra_IntSerialDenseVector Profile_;
  Epetra_IntSerialDenseVector RowPerm_;
  Epetra_IntSerialDenseVector InvRowPerm_;
  int NumJaggedDiagonals_;

};
#endif /* EPETRA_JADMATRIX_H */