Amesos_Dscpack Class Reference

Amesos_Dscpack: An object-oriented wrapper for Dscpack. More...

#include <Amesos_Dscpack.h>

Inheritance diagram for Amesos_Dscpack:

Collaboration diagram for Amesos_Dscpack:

Public Member Functions
	Amesos_Dscpack (const Epetra_LinearProblem &LinearProblem)
	Amesos_Dscpack Constructor. More...
	~Amesos_Dscpack (void)
	Amesos_Dscpack Destructor. More...
int	SymbolicFactorization ()
	Performs SymbolicFactorization on the matrix A. More...
int	NumericFactorization ()
	Performs NumericFactorization on the matrix A. More...
int	Solve ()
	Solves A X = B (or AT x = B) More...
const Epetra_LinearProblem *	GetProblem () const
	Returns the Epetra_LinearProblem. More...
bool	MatrixShapeOK () const
	Returns true if DSCPACK can handle this matrix shape. More...
int	SetUseTranspose (bool UseTranspose)
	If set true, X will be set to the solution of AT X = B (not A X = B) More...
bool	UseTranspose () const
	Returns the current UseTranspose setting.
const Epetra_Comm &	Comm () const
	Returns a pointer to the Epetra_Comm communicator associated with this operator.
int	SetParameters (Teuchos::ParameterList &ParameterList)
	Updates internal variables. More...
int	NumSymbolicFact () const
	Returns the number of symbolic factorizations performed by this object.
int	NumNumericFact () const
	Returns the number of numeric factorizations performed by this object.
int	NumSolve () const
	Returns the number of solves performed by this object.
void	PrintTiming () const
	Prints timing information.
void	PrintStatus () const
	Prints information about the factorization and solution phases.
void	GetTiming (Teuchos::ParameterList &TimingParameterList) const
	Extracts timing information from the current solver and places it in the parameter list.
Public Member Functions inherited from Amesos_BaseSolver
virtual	~Amesos_BaseSolver ()
	Destructor.
virtual void	setParameterList (Teuchos::RCP< Teuchos::ParameterList > const &paramList)
	Redefined from Teuchos::ParameterListAcceptor (Does Not Work)
virtual Teuchos::RCP < Teuchos::ParameterList >	getNonconstParameterList ()
	This is an empty stub.
virtual Teuchos::RCP < Teuchos::ParameterList >	unsetParameterList ()
	This is an empty stub.
Public Member Functions inherited from Teuchos::ParameterListAcceptor
virtual RCP< const ParameterList >	getParameterList () const
virtual RCP< const ParameterList >	getValidParameters () const

Detailed Description

Amesos_Dscpack: An object-oriented wrapper for Dscpack.

Amesos_Dscpack will solve a linear systems of equations: A X = B using Epetra objects and the Dscpack solver library, where A is an Epetra_RowMatrix and X and B are Epetra_MultiVector objects.

Constructor & Destructor Documentation

Amesos_Dscpack::Amesos_Dscpack

(

const Epetra_LinearProblem &

LinearProblem

)

Amesos_Dscpack Constructor.

Creates an Amesos_Dscpack instance, using an Epetra_LinearProblem, passing in an already-defined Epetra_LinearProblem object.

Note: The operator in LinearProblem must be an Epetra_RowMatrix.

References rcp().

Amesos_Dscpack::~Amesos_Dscpack

(

void

)

Amesos_Dscpack Destructor.

Completely deletes an Amesos_Dscpack object.

References PrintStatus(), Amesos_Status::PrintStatus_, PrintTiming(), Amesos_Status::PrintTiming_, and Amesos_Status::verbose_.

Member Function Documentation

const Epetra_LinearProblem* Amesos_Dscpack::GetProblem ( ) const

inlinevirtual

Returns the Epetra_LinearProblem.

Warning! Do not call return->SetOperator(...) to attempt to change the Epetra_Operator object (even if the new matrix has the same structure). This new operator matrix will be ignored!

Implements Amesos_BaseSolver.

Referenced by Comm(), MatrixShapeOK(), PrintStatus(), and Solve().

bool Amesos_Dscpack::MatrixShapeOK ( ) const

virtual

Returns true if DSCPACK can handle this matrix shape.

Returns true if the matrix shape is one that DSCPACK can handle. DSCPACK only works with symetric matrices.

Implements Amesos_BaseSolver.

References GetProblem(), and Epetra_LinearProblem::IsOperatorSymmetric().

int Amesos_Dscpack::NumericFactorization ( )

virtual

Performs NumericFactorization on the matrix A.

In addition to performing numeric factorization on the matrix A, the call to NumericFactorization() implies that no change will be made to the underlying matrix without a subsequent call to NumericFactorization().

<br >Preconditions:

• GetProblem().GetOperator() != 0 (return -1)
• MatrixShapeOk(GetProblem().GetOperator()) == true (return -6)
• The non-zero structure of the matrix should not have changed since the last call to SymbolicFactorization(). (return -2 if the number of non-zeros changes) Other changes can have arbitrary consequences.
• The distribution of the matrix should not have changed since the last call to SymbolicFactorization()
• The matrix should be indexed from 0 to n-1, unless the parameter "Reindex" was set to "true" prior to the call to SymbolicFactorization(). (return -3 - if caught)
• The paremeter "Reindex" should not be set to "true" except on CrsMatrices. (return -4)
• The paremeter "Reindex" should not be set to "true" unless Amesos was built with EpetraExt, i.e. with –enable-epetraext on the configure line. (return -4)
• Internal errors retur -5.

<br >Postconditions:

• Numeric Factorization will be performed (or marked to be performed) allowing Solve() to be performed correctly despite a potential change in in the matrix values (though not in the non-zero structure).

Returns

Integer error code, set to 0 if successful.

Implements Amesos_BaseSolver.

References Amesos_Status::IsNumericFactorizationOK_, Amesos_Status::IsSymbolicFactorizationOK_, Amesos_Status::NumNumericFact_, and SymbolicFactorization().

Referenced by Solve().

int Amesos_Dscpack::SetParameters ( Teuchos::ParameterList &  ParameterList )

virtual

Updates internal variables.

  <br \>Preconditions:<ul>
  <li>None.</li>
  </ul>

  <br \>Postconditions:<ul> 
  <li>Internal variables controlling the factorization and solve will
  be updated and take effect on all subseuent calls to NumericFactorization() 
  and Solve().</li>
  <li>All parameters whose value are to differ from the default values must 

be included in ParameterList. Parameters not specified in ParameterList revert to their default values.

Returns

Integer error code, set to 0 if successful.

Implements Amesos_BaseSolver.

int Amesos_Dscpack::SetUseTranspose ( bool  UseTranspose )

inlinevirtual

If set true, X will be set to the solution of A^T X = B (not A X = B)

If the implementation of this interface does not support transpose use, this method should return a value of -1.

<br >Preconditions:

• SetUseTranspose() should be called prior to the call to SymbolicFactorization() If NumericFactorization() or Solve() is called after SetUseTranspose() without an intervening call to SymbolicFactorization() the result is implementation dependent.

<br >Postconditions:

• The next factorization and solve will be performed with the new value of UseTranspose.

Parameters

UseTranspose

– (In) If true, solve AT X = B, otherwise solve A X = B.

Returns

Integer error code, set to 0 if successful. Set to -1 if this implementation does not support transpose.

Implements Amesos_BaseSolver.

int Amesos_Dscpack::Solve ( )

virtual

Solves A X = B (or A^T x = B)

<br >Preconditions:

• GetProblem().GetOperator() != 0 (return -1)
• MatrixShapeOk(GetProblem().GetOperator()) == true (return -6)
• GetProblem()->CheckInput (see Epetra_LinearProblem::CheckInput() for return values)
• The non-zero structure of the matrix should not have changed since the last call to SymbolicFactorization().
• The distribution of the matrix should not have changed since the last call to SymbolicFactorization()
• The matrix should not have changed since the last call to NumericFactorization().

<br >Postconditions:

• X will be set such that A X = B (or A^T X = B), within the limits of the accuracy of the underlying solver.

Returns

Integer error code, set to 0 if successful.

Implements Amesos_BaseSolver.

References Amesos_Time::AddTime(), Amesos_Utils::ComputeTrueResidual(), Amesos_Status::ComputeTrueResidual_, Amesos_Utils::ComputeVectorNorms(), Amesos_Status::ComputeVectorNorms_, Epetra_LinearProblem::GetLHS(), Epetra_LinearProblem::GetMatrix(), GetProblem(), Epetra_LinearProblem::GetRHS(), Insert, Amesos_Status::IsNumericFactorizationOK_, Epetra_BlockMap::LID(), NumericFactorization(), Epetra_RowMatrix::NumGlobalCols(), Epetra_RowMatrix::NumGlobalRows(), Amesos_Status::NumSolve_, and Amesos_Time::ResetTimer().

int Amesos_Dscpack::SymbolicFactorization ( )

virtual

Performs SymbolicFactorization on the matrix A.

In addition to performing symbolic factorization on the matrix A, the call to SymbolicFactorization() implies that no change will be made to the non-zero structure of the underlying matrix without a subsequent call to SymbolicFactorization().

<br >Preconditions:

• GetProblem().GetOperator() != 0 (return -1)
• MatrixShapeOk(GetProblem().GetOperator()) == true (return -6)

<br >Postconditions:

• Symbolic Factorization will be performed (or marked to be performed) allowing NumericFactorization() and Solve() to be called.

Returns

Integer error code, set to 0 if successful.

Implements Amesos_BaseSolver.

References Comm(), Amesos_Time::CreateTimer(), Amesos_Status::IsNumericFactorizationOK_, Amesos_Status::IsSymbolicFactorizationOK_, and Amesos_Status::NumSymbolicFact_.

Referenced by NumericFactorization().

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The documentation for this class was generated from the following files:

• Amesos_Dscpack.h
• Amesos_Dscpack.cpp