#include <Ifpack_Jacobi.h>
Inheritance diagram for Ifpack_Jacobi:
Public Member Functions  
Constructors/Destructor  
Ifpack_Jacobi (const Ifpack_OverlapGraph *OverlapGraph, bool UseReciprocal=true, int NumSteps=1)  
Constructor using Ifpack_OverlapGraph.  
Ifpack_Jacobi (const Epetra_RowMatrix *UserMatrix, bool UseReciprocal=true, int NumSteps=1)  
Constructor using Epetra_RowMatrix.  
Ifpack_Jacobi (const Ifpack_Jacobi &Source)  
Copy constructor.  
virtual  ~Ifpack_Jacobi () 
Ifpack_Jacobi Destructor.  
Attribute access methods.  
bool  UseReciprocal () const 
Returns current value of UseReciprocal.  
int  NumSteps () const 
Returns current value of NumSteps.  
const Epetra_Vector &  DiagValues () const 
Returns current vector of diagonal values.  
Protected Member Functions  
Methods needed to implement OverlapFactorObject.  
int  ProcessOverlapMatrix (const Epetra_RowMatrix &A) 
Processes the overlapped user matrix for computing the ILUT preconditioner: WARNING: THIS ROUTINE IS NOT USER CALLABLE, CALL InitValues().  
int  DerivedFactor () 
Compute ILUT factors L and U: WARNING: THIS ROUTINE IS NOT USER CALLABLE, CALL Factor(). 
This class supports the construction and use of Jacobi's basic iterative method as a preconditioner for a Krylov iterative method. It is also possible to use this class to solve a problem using Jacobi's method only. Formally Jacobi's method is an iteration of the form:
where , and are the strictly lower triangle, diagonal, and upper triangular parts, resp. of the user matrix . (See Saad {Iterative Methods for Sparse Linear Systems}, Ch. 4). To start the Jacobi iteration, we use an initial guess of , so a single step is equivalent to scaling the input vector by the inverse of the diagonal of .
Use of more than one step is often not beneficial.
There are two parameters for this class:

Constructor using Ifpack_OverlapGraph. Creates an object from the overlap graph.


Constructor using Epetra_RowMatrix. Creates an Ifpack_Graph object from the user graph implicitly defined by the Epetra_RowMatrix interface.
