Ifpack_IKLU: A class for constructing and using an incomplete LU factorization of a given Epetra_RowMatrix. More...
#include <Ifpack_IKLU.h>
Public Member Functions | |
Ifpack_IKLU (const Epetra_RowMatrix *A) | |
Ifpack_IKLU constuctor with variable number of indices per row. | |
virtual | ~Ifpack_IKLU () |
Ifpack_IKLU Destructor. | |
int | SetParameters (Teuchos::ParameterList ¶meterlis) |
Set parameters using a Teuchos::ParameterList object. | |
int | Initialize () |
Initialize L and U with values from user matrix A. More... | |
bool | IsInitialized () const |
Returns true if the preconditioner has been successfully initialized. | |
int | Compute () |
Compute IC factor U using the specified graph, diagonal perturbation thresholds and relaxation parameters. More... | |
bool | IsComputed () const |
If factor is completed, this query returns true, otherwise it returns false. | |
int | ApplyInverse (const Epetra_MultiVector &X, Epetra_MultiVector &Y) const |
Returns the result of a Ifpack_IKLU forward/back solve on a Epetra_MultiVector X in Y. More... | |
int | Apply (const Epetra_MultiVector &X, Epetra_MultiVector &Y) const |
double | Condest (const Ifpack_CondestType CT=Ifpack_Cheap, const int MaxIters=1550, const double Tol=1e-9, Epetra_RowMatrix *Matrix_in=0) |
Computed the estimated condition number and returns the value. | |
double | Condest () const |
Returns the computed estimated condition number, or -1.0 if no computed. | |
int | SetUseTranspose (bool UseTranspose_in) |
If set true, transpose of this operator will be applied. More... | |
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_Map & | OperatorDomainMap () const |
Returns the Epetra_Map object associated with the domain of this operator. | |
const Epetra_Map & | OperatorRangeMap () const |
Returns the Epetra_Map object associated with the range of this operator. | |
const Epetra_Comm & | Comm () const |
Returns the Epetra_BlockMap object associated with the range of this matrix operator. | |
const Epetra_RowMatrix & | Matrix () const |
Returns a reference to the matrix to be preconditioned. | |
const Epetra_CrsMatrix & | L () const |
Returns a reference to the L factor. | |
const Epetra_CrsMatrix & | U () const |
Returns a reference to the U factor. | |
const char * | Label () const |
Returns the label of this object. | |
int | SetLabel (const char *Label_in) |
Sets the label for this object. | |
virtual std::ostream & | Print (std::ostream &os) const |
Prints basic information on iostream. This function is used by operator<<. | |
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. | |
double | LevelOfFill () const |
double | RelaxValue () const |
Set relative threshold value. | |
double | AbsoluteThreshold () const |
Get absolute threshold value. | |
double | RelativeThreshold () const |
Get relative threshold value. | |
double | DropTolerance () const |
Gets the dropping tolerance. | |
int | NumGlobalNonzeros () const |
Returns the number of nonzero entries in the global graph. | |
long long | NumGlobalNonzeros64 () const |
int | NumMyNonzeros () const |
Returns the number of nonzero entries in the local graph. | |
Ifpack_IKLU: A class for constructing and using an incomplete LU factorization of a given Epetra_RowMatrix.
The Ifpack_IKLU class computes a "Relaxed" IKLU factorization with level k fill of a given Epetra_RowMatrix.
Please refer to General description of incomplete factorizations for a general description of the ILU algorithm.
The complete list of supported parameters is reported in page List of Supported Parameters.
Definition at line 79 of file Ifpack_IKLU.h.
|
virtual |
Returns the result of a Ifpack_IKLU forward/back solve on a Epetra_MultiVector X in Y.
X | - (In) A Epetra_MultiVector of dimension NumVectors to solve for. |
Y | - (Out) A Epetra_MultiVector of dimension NumVectorscontaining result. |
Implements Ifpack_Preconditioner.
Definition at line 335 of file Ifpack_IKLU.cpp.
References Epetra_Time::ElapsedTime(), IsComputed(), and Epetra_Time::ResetStartTime().
|
virtual |
Compute IC factor U using the specified graph, diagonal perturbation thresholds and relaxation parameters.
This function computes the RILU(k) factors L and U using the current:
InitValues() must be called before the factorization can proceed.
Implements Ifpack_Preconditioner.
Definition at line 228 of file Ifpack_IKLU.cpp.
References Comm(), Epetra_Time::ElapsedTime(), Epetra_RowMatrix::ExtractMyRowCopy(), Initialize(), IsInitialized(), Epetra_RowMatrix::MaxNumEntries(), Epetra_RowMatrix::NumMyRows(), Epetra_Comm::NumProc(), Epetra_Time::ResetStartTime(), Epetra_RowMatrix::RowMatrixRowMap(), Epetra_Comm::SumAll(), and View.
|
virtual |
Initialize L and U with values from user matrix A.
Copies values from the user's matrix into the nonzero pattern of L and U.
In | A - User matrix to be factored. |
Implements Ifpack_Preconditioner.
Definition at line 153 of file Ifpack_IKLU.cpp.
References Epetra_Operator::Comm(), Comm(), Epetra_Time::ElapsedTime(), Epetra_RowMatrix::ExtractMyRowCopy(), Matrix(), Epetra_RowMatrix::MaxNumEntries(), Epetra_RowMatrix::NumMyNonzeros(), Epetra_RowMatrix::NumMyRows(), Epetra_Comm::NumProc(), and Epetra_Time::ResetStartTime().
Referenced by Compute().
|
inlinevirtual |
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.
UseTranspose_in | - (In) If true, multiply by the transpose of operator, otherwise just use operator. |
Implements Epetra_Operator.
Definition at line 167 of file Ifpack_IKLU.h.