Anasazi::EpetraGenOp Class Reference

Adapter class for creating an operators often used in solving generalized eigenproblems. More...

#include <AnasaziEpetraAdapter.hpp>

Inheritance diagram for Anasazi::EpetraGenOp:

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Collaboration diagram for Anasazi::EpetraGenOp:
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List of all members.

Public Member Functions

 EpetraGenOp (const Teuchos::RefCountPtr< Epetra_Operator > &AOp, const Teuchos::RefCountPtr< Epetra_Operator > &MOp, bool isAInverse=true)
 Basic constructor for applying operator $A^{-1}M$ [default] or $AM$.
 ~EpetraGenOp ()
 Destructor.
ReturnType Apply (const MultiVec< double > &X, MultiVec< double > &Y) const
 Apply method [inherited from Anasazi::Operator class].
int Apply (const Epetra_MultiVector &X, Epetra_MultiVector &Y) const
 Apply method [inherited from Epetra_Operator class].
int ApplyInverse (const Epetra_MultiVector &X, Epetra_MultiVector &Y) const
 Apply inverse method [inherited from Epetra_Operator class].
const char * Label () const
 Returns a character string describing the operator.
bool UseTranspose () const
 Returns the current UseTranspose setting [always false for this operator].
int SetUseTranspose (bool UseTranspose)
 If set true, the transpose of this operator will be applied [not functional for this operator].
bool HasNormInf () const
 Returns true if this object can provide an approximate inf-norm [always false for this operator].
double NormInf () const
 Returns the infinity norm of the global matrix [not functional for this operator].
const Epetra_CommComm () const
 Returns the Epetra_Comm communicator associated with this operator.
const Epetra_MapOperatorDomainMap () const
 Returns the Epetra_Map object associated with the domain of this operator.
const Epetra_MapOperatorRangeMap () const
 Returns the Epetra_Map object associated with the range of this operator.

Detailed Description

Adapter class for creating an operators often used in solving generalized eigenproblems.

This class will apply the operation $A^{-1}M$ [default] or $AM$, for the Apply method of the Epetra_Operator / Anasazi::Operator. The Anasazi::EpetraGenOp operator is useful when spectral transformations are used within eigensolvers. For instance, $A^{-1}M$ is a shift and invert spectral transformation commonly used with Anasazi::BlockKrylovSchur to compute the smallest-magnitude eigenvalues for the eigenproblem $Ax = \lambda Mx$.

Note:
The Epetra package performs double-precision arithmetic, so the use of Epetra with Anasazi will only provide a double-precision eigensolver.


Constructor & Destructor Documentation

Anasazi::EpetraGenOp::EpetraGenOp const Teuchos::RefCountPtr< Epetra_Operator > &  AOp,
const Teuchos::RefCountPtr< Epetra_Operator > &  MOp,
bool  isAInverse = true
 

Basic constructor for applying operator $A^{-1}M$ [default] or $AM$.

If isAInverse is true this operator will apply $A^{-1}M$, else it will apply $AM$.


Member Function Documentation

int Anasazi::EpetraGenOp::Apply const Epetra_MultiVector X,
Epetra_MultiVector Y
const [virtual]
 

Apply method [inherited from Epetra_Operator class].

This method will apply $A^{-1}M$ or $AM$ to X, returning Y.

Implements Epetra_Operator.

ReturnType Anasazi::EpetraGenOp::Apply const MultiVec< double > &  X,
MultiVec< double > &  Y
const [virtual]
 

Apply method [inherited from Anasazi::Operator class].

This method will apply $A^{-1}M$ or $AM$ to X, returning Y.

Implements Anasazi::Operator< double >.

int Anasazi::EpetraGenOp::ApplyInverse const Epetra_MultiVector X,
Epetra_MultiVector Y
const [virtual]
 

Apply inverse method [inherited from Epetra_Operator class].

This method will apply $(A^{-1}M)^{-1}$ or $(AM)^{-1}$ to X, returning Y.

Implements Epetra_Operator.


The documentation for this class was generated from the following file:
Generated on Thu Sep 18 12:41:36 2008 for Anasazi by doxygen 1.3.9.1