Teko_EpetraHelpers.hpp

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//      Teko: A package for block and physics based preconditioning
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#ifndef __Teko_EpetraHelpers_hpp__
#define __Teko_EpetraHelpers_hpp__

// stl includes
#include <string>

// Epetra includes
#include "Epetra_Operator.h"
#include "Epetra_CrsMatrix.h"
#include "Epetra_MultiVector.h"

// Teuchos includes
#include "Teuchos_RCP.hpp"

// Thyra includes
#include "Thyra_VectorBase.hpp"
#include "Thyra_DefaultSpmdMultiVector.hpp"

namespace Teko {

namespace Epetra {

void fillDefaultSpmdMultiVector(Teuchos::RCP<Thyra::DefaultSpmdMultiVector<double> > & spmdMV,
                                Teuchos::RCP<Epetra_MultiVector> & epetraMV);

const Teuchos::RCP<const Thyra::LinearOpBase<double> > thyraDiagOp(const Teuchos::RCP<const Epetra_Vector> & ev,
                                                                   const Epetra_Map & map,const std::string & lbl="ANYM");

const Teuchos::RCP<Thyra::LinearOpBase<double> > thyraDiagOp(const Teuchos::RCP<Epetra_Vector> & ev,
                                                             const Epetra_Map & map,const std::string & lbl="ANYM");

void identityRowIndices(const Epetra_Map & rowMap, const Epetra_CrsMatrix & mat,std::vector<int> & outIndices);

void zeroMultiVectorRowIndices(Epetra_MultiVector & mv,const std::vector<int> & zeroIndices);

class ZeroedOperator : public Epetra_Operator {
public:
   ZeroedOperator(const std::vector<int> & zeroIndices,const Teuchos::RCP<const Epetra_Operator> & op);



   virtual ~ZeroedOperator() {}

   int SetUseTranspose(bool UseTranspose) { return -1;}

   int Apply(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const;

   int ApplyInverse(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const 
   { return -1; }

   double NormInf() const { return -1.0; }

   const char* Label() const 
   {return ("zeroed( "+std::string(epetraOp_->Label())+" )").c_str(); }

   bool UseTranspose() const {return false;}

   bool HasNormInf() const {return false;}
   
   const Epetra_Comm & Comm() const {return epetraOp_->Comm(); }

   const Epetra_Map& OperatorDomainMap() const {return epetraOp_->OperatorDomainMap(); }

   const Epetra_Map& OperatorRangeMap() const {return epetraOp_->OperatorRangeMap(); }


protected:
   std::vector<int> zeroIndices_;
   const Teuchos::RCP<const Epetra_Operator> epetraOp_;
};

} // end namespace Epetra
} // end namespace Teko

#endif