AnasaziEpetraAdapter.hpp

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// @HEADER
// ***********************************************************************
//
//                 Anasazi: Block Eigensolvers Package
//                 Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
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#ifndef ANASAZI_EPETRA_ADAPTER_HPP
#define ANASAZI_EPETRA_ADAPTER_HPP

#include "AnasaziConfigDefs.hpp"
#include "Anasaziepetra_DLLExportMacro.h"
#include "AnasaziTypes.hpp"
#include "AnasaziMultiVec.hpp"
#include "AnasaziOperator.hpp"

#include "Teuchos_TestForException.hpp"
#include "Teuchos_SerialDenseMatrix.hpp"
#include "Epetra_MultiVector.h"
#include "Epetra_Vector.h"
#include "Epetra_Operator.h"
#include "Epetra_Map.h"
#include "Epetra_LocalMap.h"

namespace Anasazi {



  class EpetraMultiVecFailure : public AnasaziError {public:
    EpetraMultiVecFailure(const std::string& what_arg) : AnasaziError(what_arg)
    {}};

  class EpetraOpFailure : public AnasaziError {public:
    EpetraOpFailure(const std::string& what_arg) : AnasaziError(what_arg)
    {}};

  
  //
  //--------template class AnasaziEpetraMultiVec-----------------
  //
  
  class ANASAZIEPETRA_LIB_DLL_EXPORT EpetraMultiVec : public MultiVec<double>, public Epetra_MultiVector {
  public:



    EpetraMultiVec(const Epetra_BlockMap& Map_in, const int numvecs);

    EpetraMultiVec(const Epetra_MultiVector & P_vec);
    

    EpetraMultiVec(const Epetra_BlockMap& Map_in, double * array, const int numvecs, const int stride=0);


    EpetraMultiVec(Epetra_DataAccess CV, const Epetra_MultiVector& P_vec, const std::vector<int>& index);

    virtual ~EpetraMultiVec() {};




    MultiVec<double> * Clone ( const int numvecs ) const;

    MultiVec<double> * CloneCopy () const;

    MultiVec<double> * CloneCopy ( const std::vector<int>& index ) const;
    
    MultiVec<double> * CloneViewNonConst ( const std::vector<int>& index );

    const MultiVec<double> * CloneView ( const std::vector<int>& index ) const;




    int GetNumberVecs () const { return NumVectors(); }

    int GetVecLength () const { return GlobalLength(); }




    void MvTimesMatAddMv ( double alpha, const MultiVec<double>& A, 
                           const Teuchos::SerialDenseMatrix<int,double>& B, 
                           double beta );

    void MvAddMv ( double alpha, const MultiVec<double>& A, 
                   double beta, const MultiVec<double>& B);

    void MvTransMv ( double alpha, const MultiVec<double>& A, Teuchos::SerialDenseMatrix<int,double>& B 
#ifdef HAVE_ANASAZI_EXPERIMENTAL
        , ConjType conj = Anasazi::CONJ
#endif
        ) const;
  
    void MvDot ( const MultiVec<double>& A, std::vector<double> &b
#ifdef HAVE_ANASAZI_EXPERIMENTAL
        , ConjType conj = Anasazi::CONJ
#endif
        ) const;

    void MvScale ( double alpha ) { 
      TEST_FOR_EXCEPTION( this->Scale( alpha )!=0, EpetraMultiVecFailure,
          "Anasazi::EpetraMultiVec::MvScale call to Epetra_MultiVector::Scale() returned a nonzero value.");
    }
    
    void MvScale ( const std::vector<double>& alpha );



    
    void MvNorm ( std::vector<double> & normvec ) const {
      if (((int)normvec.size() >= GetNumberVecs()) ) {
        TEST_FOR_EXCEPTION( this->Norm2(&normvec[0])!=0, EpetraMultiVecFailure,
            "Anasazi::EpetraMultiVec::MvNorm call to Epetra_MultiVector::Norm2() returned a nonzero value.");
      }
    };
    


    void SetBlock ( const MultiVec<double>& A, const std::vector<int>& index );

    void MvRandom() { 
      TEST_FOR_EXCEPTION( this->Random()!=0, EpetraMultiVecFailure,
          "Anasazi::EpetraMultiVec::MvRandom call to Epetra_MultiVector::Random() returned a nonzero value.");
    };

    void MvInit ( double alpha ) { 
      TEST_FOR_EXCEPTION( this->PutScalar( alpha )!=0, EpetraMultiVecFailure,
          "Anasazi::EpetraMultiVec::MvInit call to Epetra_MultiVector::PutScalar() returned a nonzero value.");
    };
    



    void MvPrint( std::ostream& os ) const { os << *this << std::endl; };

  private:
  };
  //-------------------------------------------------------------
  
  //
  //--------template class AnasaziEpetraOp---------------------
  //
  
  class ANASAZIEPETRA_LIB_DLL_EXPORT EpetraOp : public virtual Operator<double> {
  public:

    
    EpetraOp(const Teuchos::RCP<Epetra_Operator> &Op );
    
    ~EpetraOp();
    

    
    void Apply ( const MultiVec<double>& X, MultiVec<double>& Y ) const;
    
  private:
//use pragmas to disable some false-positive warnings for windows 
// sharedlibs export
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4251)
#endif
    Teuchos::RCP<Epetra_Operator> Epetra_Op;
#ifdef _MSC_VER
#pragma warning(pop)
#endif
  };
  //-------------------------------------------------------------

  //
  //--------template class AnasaziEpetraGenOp--------------------
  //
  
  class ANASAZIEPETRA_LIB_DLL_EXPORT EpetraGenOp : public virtual Operator<double>, public virtual Epetra_Operator {
  public:

    EpetraGenOp(const Teuchos::RCP<Epetra_Operator> &AOp, 
                const Teuchos::RCP<Epetra_Operator> &MOp,
                bool isAInverse = true );

    ~EpetraGenOp();
    

    void Apply ( const MultiVec<double>& X, MultiVec<double>& Y ) const; 


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


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

    const char* Label() const { return "Epetra_Operator applying A^{-1}M"; };
    
    bool UseTranspose() const { return (false); };

    int SetUseTranspose(bool /*UseTranspose_in*/) { return 0; };
    
    bool HasNormInf() const { return (false); };
    
    double NormInf() const  { return (-1.0); };
    
    const Epetra_Comm& Comm() const { return Epetra_AOp->Comm(); };

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

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

  private:
    bool isAInverse;

//use pragmas to disable some false-positive warnings for windows 
// sharedlibs export
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4251)
#endif
    Teuchos::RCP<Epetra_Operator> Epetra_AOp;
    Teuchos::RCP<Epetra_Operator> Epetra_MOp;
#ifdef _MSC_VER
#pragma warning(pop)
#endif
  };
  
  //
  //--------template class AnasaziEpetraSymOp--------------------
  //

  class ANASAZIEPETRA_LIB_DLL_EXPORT EpetraSymOp : public virtual Operator<double>, public virtual Epetra_Operator {
  public:

    EpetraSymOp(const Teuchos::RCP<Epetra_Operator> &Op, bool isTrans = false );

    ~EpetraSymOp();
    

    void Apply ( const MultiVec<double>& X, MultiVec<double>& Y ) const; 


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


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

    const char* Label() const { return "Epetra_Operator applying A^TA or AA^T"; };
    
    bool UseTranspose() const { return (false); };

    int SetUseTranspose(bool /*UseTranspose_in*/) { return 0; };
    
    bool HasNormInf() const { return (false); };
    
    double NormInf() const  { return (-1.0); };
    
    const Epetra_Comm& Comm() const { return Epetra_Op->Comm(); };

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

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

  private:

//use pragmas to disable false-positive warnings in generating windows sharedlib exports
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4251)
#endif
    Teuchos::RCP<Epetra_Operator> Epetra_Op;
#ifdef _MSC_VER
#pragma warning(pop)
#endif

    bool isTrans_;
  };


  //
  //--------template class AnasaziEpetraSymMVOp---------------------
  //

  class ANASAZIEPETRA_LIB_DLL_EXPORT EpetraSymMVOp : public virtual Operator<double> {
  public:

    EpetraSymMVOp(const Teuchos::RCP<const Epetra_MultiVector> &MV, 
                  bool isTrans = false );
    
    ~EpetraSymMVOp() {};
    

    void Apply ( const MultiVec<double>& X, MultiVec<double>& Y ) const; 

  private:

//use pragmas to disable some false-positive warnings for windows 
// sharedlibs export
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4251)
#endif
    Teuchos::RCP<const Epetra_MultiVector> Epetra_MV;
    Teuchos::RCP<const Epetra_Map> MV_localmap;
    Teuchos::RCP<const Epetra_BlockMap> MV_blockmap;
#ifdef _MSC_VER
#pragma warning(pop)
#endif

    bool isTrans_;
  };

  //
  //--------template class AnasaziEpetraWSymMVOp---------------------
  //

  class ANASAZIEPETRA_LIB_DLL_EXPORT EpetraWSymMVOp : public virtual Operator<double> {
  public:
    EpetraWSymMVOp(const Teuchos::RCP<const Epetra_MultiVector> &MV, 
                   const Teuchos::RCP<Epetra_Operator> &OP );
    
    ~EpetraWSymMVOp() {};
    

    void Apply ( const MultiVec<double>& X, MultiVec<double>& Y ) const; 

  private:
//use pragmas to disable some false-positive warnings for windows 
// sharedlibs export
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4251)
#endif
    Teuchos::RCP<const Epetra_MultiVector> Epetra_MV;
    Teuchos::RCP<Epetra_Operator> Epetra_OP;
    Teuchos::RCP<Epetra_MultiVector> Epetra_WMV;
    Teuchos::RCP<const Epetra_Map> MV_localmap;
    Teuchos::RCP<const Epetra_BlockMap> MV_blockmap;
#ifdef _MSC_VER
#pragma warning(pop)
#endif
  };

  //
  //--------template class AnasaziEpetraW2SymMVOp---------------------
  //

  class ANASAZIEPETRA_LIB_DLL_EXPORT EpetraW2SymMVOp : public virtual Operator<double> {
  public:
    EpetraW2SymMVOp(const Teuchos::RCP<const Epetra_MultiVector> &MV, 
                   const Teuchos::RCP<Epetra_Operator> &OP );
    
    ~EpetraW2SymMVOp() {};
    

    void Apply ( const MultiVec<double>& X, MultiVec<double>& Y ) const; 

  private:
//use pragmas to disable some false-positive warnings for windows 
// sharedlibs export
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4251)
#endif
    Teuchos::RCP<const Epetra_MultiVector> Epetra_MV;
    Teuchos::RCP<Epetra_Operator> Epetra_OP;
    Teuchos::RCP<Epetra_MultiVector> Epetra_WMV;
    Teuchos::RCP<const Epetra_Map> MV_localmap;
    Teuchos::RCP<const Epetra_BlockMap> MV_blockmap;
#ifdef _MSC_VER
#pragma warning(pop)
#endif
  };

  
  //
  // Implementation of the Anasazi::MultiVecTraits for Epetra::MultiVector.
  //

  template<>
  class MultiVecTraits<double, Epetra_MultiVector>
  {
  public:



    static Teuchos::RCP<Epetra_MultiVector> Clone( const Epetra_MultiVector& mv, const int numvecs )
    { 
#ifdef TEUCHOS_DEBUG
      TEST_FOR_EXCEPTION(numvecs <= 0,std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::Clone(mv,numvecs): numvecs must be greater than zero.");
#endif
      return Teuchos::rcp( new Epetra_MultiVector(mv.Map(), numvecs) ); 
    }

    static Teuchos::RCP<Epetra_MultiVector> CloneCopy( const Epetra_MultiVector& mv )
    { return Teuchos::rcp( new Epetra_MultiVector( mv ) ); }

    static Teuchos::RCP<Epetra_MultiVector> CloneCopy( const Epetra_MultiVector& mv, const std::vector<int>& index )
    { 
#ifdef TEUCHOS_DEBUG
      TEST_FOR_EXCEPTION(index.size() == 0,std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::Clone(mv,index): numvecs must be greater than zero.");
      TEST_FOR_EXCEPTION( *std::min_element(index.begin(),index.end()) < 0, std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::Clone(mv,index): indices must be >= zero.");
      TEST_FOR_EXCEPTION( *std::max_element(index.begin(),index.end()) >= mv.NumVectors(), std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::Clone(mv,index): indices must be < mv.NumVectors().");
#endif
      std::vector<int>& tmp_index = const_cast<std::vector<int> &>( index );
      return Teuchos::rcp( new Epetra_MultiVector(::Copy, mv, &tmp_index[0], index.size()) ); 
    }

    static Teuchos::RCP<Epetra_MultiVector> CloneViewNonConst( Epetra_MultiVector& mv, const std::vector<int>& index )
    { 
#ifdef TEUCHOS_DEBUG
      TEST_FOR_EXCEPTION(index.size() == 0,std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::CloneViewNonConst(mv,index): numvecs must be greater than zero.");
      TEST_FOR_EXCEPTION( *std::min_element(index.begin(),index.end()) < 0, std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::CloneViewNonConst(mv,index): indices must be >= zero.");
      TEST_FOR_EXCEPTION( *std::max_element(index.begin(),index.end()) >= mv.NumVectors(), std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::CloneViewNonConst(mv,index): indices must be < mv.NumVectors().");
#endif
      std::vector<int>& tmp_index = const_cast<std::vector<int> &>( index );
      return Teuchos::rcp( new Epetra_MultiVector(::View, mv, &tmp_index[0], index.size()) ); 
    }

    static Teuchos::RCP<const Epetra_MultiVector> CloneView( const Epetra_MultiVector& mv, const std::vector<int>& index )
    { 
#ifdef TEUCHOS_DEBUG
      TEST_FOR_EXCEPTION(index.size() == 0,std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::Clone(const mv,index): numvecs must be greater than zero.");
      TEST_FOR_EXCEPTION( *std::min_element(index.begin(),index.end()) < 0, std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::Clone(const mv,index): indices must be >= zero.");
      TEST_FOR_EXCEPTION( *std::max_element(index.begin(),index.end()) >= mv.NumVectors(), std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::Clone(const mv,index): indices must be < mv.NumVectors().");
#endif
      std::vector<int>& tmp_index = const_cast<std::vector<int> &>( index );
      return Teuchos::rcp( new Epetra_MultiVector(::View, mv, &tmp_index[0], index.size()) ); 
    }




    static int GetVecLength( const Epetra_MultiVector& mv )
    { return mv.GlobalLength(); }

    static int GetNumberVecs( const Epetra_MultiVector& mv )
    { return mv.NumVectors(); }



    static void MvTimesMatAddMv( double alpha, const Epetra_MultiVector& A, 
                                 const Teuchos::SerialDenseMatrix<int,double>& B, 
                                 double beta, Epetra_MultiVector& mv )
    { 
      Epetra_LocalMap LocalMap(B.numRows(), 0, mv.Map().Comm());
      Epetra_MultiVector B_Pvec(::View, LocalMap, B.values(), B.stride(), B.numCols());

      TEST_FOR_EXCEPTION( mv.Multiply( 'N', 'N', alpha, A, B_Pvec, beta )!=0, EpetraMultiVecFailure,
          "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvNorm call to Epetra_MultiVector::Multiply() returned a nonzero value.");
    }

    static void MvAddMv( double alpha, const Epetra_MultiVector& A, double beta, const Epetra_MultiVector& B, Epetra_MultiVector& mv )
    { 
      // epetra mv.Update(alpha,A,beta,B,gamma) will check 
      //   alpha == 0.0 
      // and 
      //   beta == 0.0 
      // and based on this will call 
      //   mv.Update(beta,B,gamma) 
      // or 
      //   mv.Update(alpha,A,gamma)
      //
      // mv.Update(alpha,A,gamma) 
      // will then check for one of 
      //   gamma == 0
      // or 
      //   gamma == 1
      // or 
      //   alpha == 1 
      // in that order. however, it will not look for the combination
      //   alpha == 1 and gamma = 0
      // which is a common use case when we wish to assign 
      //   mv = A   (in which case alpha == 1, beta == gamma == 0)
      // or 
      //   mv = B   (in which case beta == 1, alpha == gamma == 0)
      // 
      // therefore, we will check for these use cases ourselves
      if (beta == 0.0) {
        if (alpha == 1.0) {
          // assign
          mv = A;
        }
        else {
          // single update
          TEST_FOR_EXCEPTION( mv.Update( alpha, A, 0.0 )!=0, EpetraMultiVecFailure,
              "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvAddMv call to Epetra_MultiVector::Update(alpha,A,0.0) returned a nonzero value.");
        }
      }
      else if (alpha == 0.0) {
        if (beta == 1.0) {
          // assign 
          mv = B;
        }
        else {
          // single update
          TEST_FOR_EXCEPTION( mv.Update( beta, B, 0.0 )!=0, EpetraMultiVecFailure,
              "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvAddMv call to Epetra_MultiVector::Update(beta,B,0.0) returned a nonzero value.");
        }
      }
      else {
        // double update
        TEST_FOR_EXCEPTION( mv.Update( alpha, A, beta, B, 0.0 )!=0, EpetraMultiVecFailure,
            "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvAddMv call to Epetra_MultiVector::Update(alpha,A,beta,B,0.0) returned a nonzero value.");
      }
    }

    static void MvTransMv( double alpha, const Epetra_MultiVector& A, const Epetra_MultiVector& mv, Teuchos::SerialDenseMatrix<int,double>& B
#ifdef HAVE_ANASAZI_EXPERIMENTAL
                          , ConjType conj = Anasazi::CONJ
#endif
                        )
    { 
      Epetra_LocalMap LocalMap(B.numRows(), 0, mv.Map().Comm());
      Epetra_MultiVector B_Pvec(::View, LocalMap, B.values(), B.stride(), B.numCols());
      
      TEST_FOR_EXCEPTION( B_Pvec.Multiply( 'T', 'N', alpha, A, mv, 0.0 )!=0, EpetraMultiVecFailure,
          "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvTransMv call to Epetra_MultiVector::Multiply() returned a nonzero value.");
    }
    
    static void MvDot( const Epetra_MultiVector& A, const Epetra_MultiVector& B, std::vector<double> &b
#ifdef HAVE_ANASAZI_EXPERIMENTAL
                      , ConjType conj = Anasazi::CONJ
#endif
                      )
    {
#ifdef TEUCHOS_DEBUG
      TEST_FOR_EXCEPTION(A.NumVectors() != B.NumVectors(),std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::MvDot(A,B,b): A and B must have the same number of vectors.");
      TEST_FOR_EXCEPTION(b.size() != (unsigned int)A.NumVectors(),std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::MvDot(A,B,b): b must have room for all dot products.");
#endif
      TEST_FOR_EXCEPTION( A.Dot( B, &b[0] )!=0, EpetraMultiVecFailure,
          "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvDot(A,B,b) call to Epetra_MultiVector::Dot() returned a nonzero value.");     
    }




    static void MvNorm( const Epetra_MultiVector& mv, std::vector<double> &normvec )
    { 
#ifdef TEUCHOS_DEBUG
      TEST_FOR_EXCEPTION((unsigned int)mv.NumVectors() != normvec.size(),std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::MvNorm(mv,normvec): normvec must be the same size of mv.");
#endif
      TEST_FOR_EXCEPTION( mv.Norm2(&normvec[0])!=0, EpetraMultiVecFailure,
          "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvNorm call to Epetra_MultiVector::Norm2() returned a nonzero value."); 
    }

    


    static void SetBlock( const Epetra_MultiVector& A, const std::vector<int>& index, Epetra_MultiVector& mv )
    { 
      TEST_FOR_EXCEPTION((unsigned int)A.NumVectors() != index.size(),std::invalid_argument,
          "Anasazi::MultiVecTraits<double,Epetra_MultiVector>::SetBlock(A,index,mv): index must be the same size as A");
      Teuchos::RCP<Epetra_MultiVector> mv_sub = CloneViewNonConst(mv,index);
      *mv_sub = A;
    }

    static void MvScale ( Epetra_MultiVector& mv, double alpha ) 
    { 
      TEST_FOR_EXCEPTION( mv.Scale( alpha )!=0, EpetraMultiVecFailure,
          "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvScale call to Epetra_MultiVector::Scale(mv,double alpha) returned a nonzero value."); 
    }

    static void MvScale ( Epetra_MultiVector& mv, const std::vector<double>& alpha )
    { 
      // Check to make sure the vector is as long as the multivector has columns.
      int numvecs = mv.NumVectors();
#ifdef TEUCHOS_DEBUG
      TEST_FOR_EXCEPTION( alpha.size() != (unsigned int)numvecs, std::invalid_argument,
                          "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvScale(mv,vector alpha): size of alpha inconsistent with number of vectors in mv.")
#endif
      for (int i=0; i<numvecs; i++) {
        TEST_FOR_EXCEPTION( mv(i)->Scale(alpha[i])!=0, EpetraMultiVecFailure,
            "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvScale call to Epetra_MultiVector::Scale() returned a nonzero value.");
      }
    }

    static void MvRandom( Epetra_MultiVector& mv )
    { 
      TEST_FOR_EXCEPTION( mv.Random()!=0, EpetraMultiVecFailure,
          "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvRandom call to Epetra_MultiVector::Random() returned a nonzero value.");
    }

    static void MvInit( Epetra_MultiVector& mv, double alpha = Teuchos::ScalarTraits<double>::zero() )
    { 
      TEST_FOR_EXCEPTION( mv.PutScalar(alpha)!=0, EpetraMultiVecFailure,
          "Anasazi::MultiVecTraits<double, Epetra_MultiVector>::MvInit call to Epetra_MultiVector::PutScalar() returned a nonzero value.");
    }




    static void MvPrint( const Epetra_MultiVector& mv, std::ostream& os )
    { os << mv << std::endl; }

  };        

  //
  // Implementation of the Anasazi::OperatorTraits for Epetra::Operator.
  //

  template <> 
  class OperatorTraits < double, Epetra_MultiVector, Epetra_Operator >
  {
  public:
    
    static void Apply ( const Epetra_Operator& Op, 
                        const Epetra_MultiVector& x, 
                        Epetra_MultiVector& y )
    { 
#ifdef TEUCHOS_DEBUG
      TEST_FOR_EXCEPTION(x.NumVectors() != y.NumVectors(),std::invalid_argument,
          "Anasazi::OperatorTraits<double,Epetra_MultiVector,Epetra_Operator>::Apply(Op,x,y): x and y must have the same number of columns.");
#endif
      int ret = Op.Apply(x,y);
      TEST_FOR_EXCEPTION(ret != 0, OperatorError, 
          "Anasazi::OperatorTraits<double,Epetra_Multivector,Epetra_Operator>::Apply(): Error in Epetra_Operator::Apply(). Code " << ret);
    }
    
  };
  
} // end of Anasazi namespace 

#endif 
// end of file ANASAZI_EPETRA_ADAPTER_HPP

---