org.apache.commons.math3.optimization.direct
Class PowellOptimizer

java.lang.Object
  org.apache.commons.math3.optimization.direct.BaseAbstractMultivariateOptimizer<MultivariateFunction>
      org.apache.commons.math3.optimization.direct.PowellOptimizer

All Implemented Interfaces:

BaseMultivariateOptimizer<MultivariateFunction>, BaseOptimizer<PointValuePair>, MultivariateOptimizer

@Deprecated
public class PowellOptimizer
extends BaseAbstractMultivariateOptimizer<MultivariateFunction>
implements MultivariateOptimizer

Powell algorithm. This code is translated and adapted from the Python version of this algorithm (as implemented in module optimize.py v0.5 of SciPy).
The default stopping criterion is based on the differences of the function value between two successive iterations. It is however possible to define a custom convergence checker that might terminate the algorithm earlier.
The internal line search optimizer is a BrentOptimizer with a convergence checker set to SimpleUnivariateValueChecker.

Since:

2.2

Version:

$Id: PowellOptimizer.java 1462503 2013-03-29 15:48:27Z luc $

PowellOptimizer

public PowellOptimizer(double rel,
                       double abs,
                       ConvergenceChecker<PointValuePair> checker)

Deprecated. 

This constructor allows to specify a user-defined convergence checker, in addition to the parameters that control the default convergence checking procedure.
The internal line search tolerances are set to the square-root of their corresponding value in the multivariate optimizer.

Parameters:

rel - Relative threshold.

abs - Absolute threshold.

checker - Convergence checker.

Throws:

NotStrictlyPositiveException - if abs <= 0.

NumberIsTooSmallException - if rel < 2 * Math.ulp(1d).

PowellOptimizer

public PowellOptimizer(double rel,
                       double abs,
                       double lineRel,
                       double lineAbs,
                       ConvergenceChecker<PointValuePair> checker)

Deprecated. 

This constructor allows to specify a user-defined convergence checker, in addition to the parameters that control the default convergence checking procedure and the line search tolerances.

Parameters:

rel - Relative threshold for this optimizer.

abs - Absolute threshold for this optimizer.

lineRel - Relative threshold for the internal line search optimizer.

lineAbs - Absolute threshold for the internal line search optimizer.

checker - Convergence checker.

Throws:

NotStrictlyPositiveException - if abs <= 0.

NumberIsTooSmallException - if rel < 2 * Math.ulp(1d).

PowellOptimizer

public PowellOptimizer(double rel,
                       double abs)

Deprecated. 

The parameters control the default convergence checking procedure.
The internal line search tolerances are set to the square-root of their corresponding value in the multivariate optimizer.

Parameters:

rel - Relative threshold.

abs - Absolute threshold.

Throws:

NotStrictlyPositiveException - if abs <= 0.

NumberIsTooSmallException - if rel < 2 * Math.ulp(1d).

PowellOptimizer

public PowellOptimizer(double rel,
                       double abs,
                       double lineRel,
                       double lineAbs)

Deprecated. 

Builds an instance with the default convergence checking procedure.

Parameters:

rel - Relative threshold.

abs - Absolute threshold.

lineRel - Relative threshold for the internal line search optimizer.

lineAbs - Absolute threshold for the internal line search optimizer.

Throws:

NotStrictlyPositiveException - if abs <= 0.

NumberIsTooSmallException - if rel < 2 * Math.ulp(1d).

Since:

3.1

doOptimize

protected PointValuePair doOptimize()

Deprecated. 

Perform the bulk of the optimization algorithm.

Specified by:

doOptimize in class BaseAbstractMultivariateOptimizer<MultivariateFunction>

Returns:

the point/value pair giving the optimal value of the objective function.