Parallel Colt 0.7.2

## cern.colt.matrix.tdouble.algo.solver Class DoubleChebyshev

```java.lang.Object
cern.colt.matrix.tdouble.algo.solver.AbstractDoubleIterativeSolver
cern.colt.matrix.tdouble.algo.solver.DoubleChebyshev
```
All Implemented Interfaces:
DoubleIterativeSolver

`public class DoubleChebyshevextends AbstractDoubleIterativeSolver`

Chebyshev solver. Solves the symmetric positive definite linear system `Ax = b` using the Preconditioned Chebyshev Method. Chebyshev requires an acurate estimate on the bounds of the spectrum of the matrix.

Author:
Templates

Constructor Summary
```DoubleChebyshev(DoubleMatrix1D template, double eigmin, double eigmax)```
Constructor for Chebyshev.

Method Summary
` void` ```setEigenvalues(double eigmin, double eigmax)```
Sets the eigenvalue estimates.
` DoubleMatrix1D` ```solve(DoubleMatrix2D A, DoubleMatrix1D b, DoubleMatrix1D x)```
Solves the given problem, writing result into the vector.

Methods inherited from class cern.colt.matrix.tdouble.algo.solver.AbstractDoubleIterativeSolver
`getIterationMonitor, getPreconditioner, setIterationMonitor, setPreconditioner`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DoubleChebyshev

```public DoubleChebyshev(DoubleMatrix1D template,
double eigmin,
double eigmax)```
Constructor for Chebyshev. Uses the given vector as template for creating scratch vectors. Typically, the solution or the right hand side vector can be passed, and the template is not modified. Eigenvalue estimates must also be provided

Parameters:
`template` - Vector to use as template for the work vectors needed in the solution process
`eigmin` - Smallest eigenvalue. Must be positive
`eigmax` - Largest eigenvalue. Must be positive
Method Detail

### setEigenvalues

```public void setEigenvalues(double eigmin,
double eigmax)```
Sets the eigenvalue estimates.

Parameters:
`eigmin` - Smallest eigenvalue. Must be positive
`eigmax` - Largest eigenvalue. Must be positive

### solve

```public DoubleMatrix1D solve(DoubleMatrix2D A,
DoubleMatrix1D b,
DoubleMatrix1D x)
throws IterativeSolverDoubleNotConvergedException```
Description copied from interface: `DoubleIterativeSolver`
Solves the given problem, writing result into the vector.

Parameters:
`A` - Matrix of the problem
`b` - Right hand side
`x` - Solution is stored here. Also used as initial guess
Returns:
The solution vector x
Throws:
`IterativeSolverDoubleNotConvergedException`

Parallel Colt 0.7.2