Preconditioner

All Known Implementing Classes:

AMG, BlockDiagonalPreconditioner, DiagonalPreconditioner, ICC, ILU, ILUT, SSOR, TwoLevelPreconditioner
```
public interface Preconditioner
```
Preconditioner interface. Before a preconditioner is used, setMatrix must be called

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Vector`	`apply(Vector b, Vector x)`	Solves the approximate problem with the given right hand side.
`void`	`setMatrix(Matrix A)`	Sets the operator matrix for the preconditioner.
`Vector`	`transApply(Vector b, Vector x)`	Solves the approximate transpose problem with the given right hand side.

- Method Detail
  - apply
```
Vector apply(Vector b,
             Vector x)
```
    Solves the approximate problem with the given right hand side. Result is stored in given solution vector
    
    Parameters:
    
    b - Right hand side of problem
    
    x - Result is stored here
    
    Returns:
    
    x
  - transApply
```
Vector transApply(Vector b,
                  Vector x)
```
    Solves the approximate transpose problem with the given right hand side. Result is stored in given solution vector
    
    Parameters:
    
    b - Right hand side of problem
    
    x - Result is stored here
    
    Returns:
    
    x
  - setMatrix
```
void setMatrix(Matrix A)
```
    Sets the operator matrix for the preconditioner. This method must be called before a preconditioner is used by an iterative solver
    
    Parameters:
    
    A - Matrix to setup the preconditioner for. Not modified