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Ifpack_SILU Class Reference

A wrapper to SuperLU 4.0's supernodal ILUT w/ partial pivoting. More...

#include <Ifpack_SILU.h>

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List of all members.

## Public Member Functions

Constructors and destructors.
Ifpack_SILU (Epetra_RowMatrix *A)
Constructor.
~Ifpack_SILU ()
Destructor.
Construction methods
int Initialize ()
Initialize the preconditioner, does not touch matrix values.
bool IsInitialized () const
Returns true if the preconditioner has been successfully initialized.
int Compute ()
Compute ILU factors L and U using the specified graph, diagonal perturbation thresholds and relaxation parameters.
bool IsComputed () const
If factor is completed, this query returns true, otherwise it returns false.
int SetParameters (Teuchos::ParameterList &parameterlist)
Set parameters using a Teuchos::ParameterList object.
int SetUseTranspose (bool UseTranspose_in)
If set true, transpose of this operator will be applied.
Mathematical functions.
int Apply (const Epetra_MultiVector &X, Epetra_MultiVector &Y) const
int Multiply (bool Trans, const Epetra_MultiVector &X, Epetra_MultiVector &Y) const
int ApplyInverse (const Epetra_MultiVector &X, Epetra_MultiVector &Y) const
Returns the result of a Epetra_Operator inverse applied to an Epetra_MultiVector X in Y.
double Condest (const Ifpack_CondestType CT=Ifpack_Cheap, const int MaxIters=1550, const double Tol=1e-9, Epetra_RowMatrix *Matrix_in=0)
Computes the estimated condition number and returns the value.
double Condest () const
Returns the computed estimated condition number, or -1.0 if not computed.
Query methods
const char * Label () const
Returns a character string describing the operator.
int SetLabel (const char *Label_in)
Sets label for this object.
double NormInf () const
Returns 0.0 because this class cannot compute Inf-norm.
bool HasNormInf () const
Returns false because this class cannot compute an Inf-norm.
bool UseTranspose () const
Returns the current UseTranspose setting.
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.
const Epetra_CommComm () const
Returns the Epetra_BlockMap object associated with the range of this matrix operator.
const Epetra_RowMatrixMatrix () const
Returns a reference to the matrix to be preconditioned.
virtual ostream & Print (ostream &os) const
Prints on stream basic information about this object.
virtual int NumInitialize () const
Returns the number of calls to Initialize().
virtual int NumCompute () const
Returns the number of calls to Compute().
virtual int NumApplyInverse () const
Returns the number of calls to ApplyInverse().
virtual double InitializeTime () const
Returns the time spent in Initialize().
virtual double ComputeTime () const
Returns the time spent in Compute().
virtual double ApplyInverseTime () const
Returns the time spent in ApplyInverse().
virtual double InitializeFlops () const
Returns the number of flops in the initialization phase.
virtual double ComputeFlops () const
Returns the number of flops in the computation phase.
virtual double ApplyInverseFlops () const
Returns the number of flops in the application of the preconditioner.

## Detailed Description

A wrapper to SuperLU 4.0's supernodal ILUT w/ partial pivoting.

The Ifpack_SILU class is a wrapper to SuperLU 4.0's supernodal ILUT w/ partial pivoting.

Date:

Definition at line 83 of file Ifpack_SILU.h.

## Member Function Documentation

 int Ifpack_SILU::ApplyInverse ( const Epetra_MultiVector & X, Epetra_MultiVector & Y ) const [virtual]

Returns the result of a Epetra_Operator inverse applied to an Epetra_MultiVector X in Y.

In this implementation, we use several existing attributes to determine how virtual method ApplyInverse() should call the concrete method Solve(). We pass in the UpperTriangular(), the Epetra_CrsMatrix::UseTranspose(), and NoDiagonal() methods. The most notable warning is that if a matrix has no diagonal values we assume that there is an implicit unit diagonal that should be accounted for when doing a triangular solve.

Parameters:
 X - (In) A Epetra_MultiVector of dimension NumVectors to solve for. Out Y - (Out) A Epetra_MultiVector of dimension NumVectors containing result.
Returns:
Integer error code, set to 0 if successful.

Implements Ifpack_Preconditioner.

Definition at line 354 of file Ifpack_SILU.cpp.

 int Ifpack_SILU::SetUseTranspose ( bool UseTranspose_in )  [inline, virtual]

If set true, transpose of this operator will be applied.

This flag allows the transpose of the given operator to be used implicitly. Setting this flag affects only the Apply() and ApplyInverse() methods. If the implementation of this interface does not support transpose use, this method should return a value of -1.

Parameters:
 UseTranspose_in - (In) If true, multiply by the transpose of operator, otherwise just use operator.
Returns:
Always returns 0.

Implements Epetra_Operator.

Definition at line 139 of file Ifpack_SILU.h.

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