net.sourceforge.cilib.functions.continuous.unconstrained
Class Rosenbrock

java.lang.Object
  net.sourceforge.cilib.functions.Function
      net.sourceforge.cilib.functions.ContinuousFunction
          net.sourceforge.cilib.functions.continuous.unconstrained.Rosenbrock

All Implemented Interfaces:

Serializable, Cloneable

public class Rosenbrock
extends ContinuousFunction

Generalised Rosenbrock function.

Reference: X. Yao, Y. Liu, G. Liu, Evolutionary Programming Made Faster, IEEE Transactions on Evolutionary Computation, 3(2):82--102, 1999

Characteristics:

• Unimodal
• Non Separable
• Continuous
• Regular

f(x) = 0; x = 1 x e [-2.048,2.048]

Author:

Edwin Peer

See Also:

Serialized Form

Constructor Summary

Rosenbrock()
Create an instance of Rosenbrock.

Method Summary

double	evaluate(Vector x) Evaluate the function with the given Vector as input.
Rosenbrock	getClone() Create a cloned copy of the current object and return it.
Object	getMinimum() Accessor for the function minimum.

Methods inherited from class net.sourceforge.cilib.functions.ContinuousFunction

evaluate, getMaximum

Methods inherited from class net.sourceforge.cilib.functions.Function

getBehavioralDomainRegistry, getDimension, getDomain, getDomainRegistry, setBehavioralDomain, setBehaviouralDomainRegistry, setDomain

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Rosenbrock

public Rosenbrock()

Create an instance of Rosenbrock. Domain is set to R(-2.048, 2.048)^30.

Method Detail

getClone

public Rosenbrock getClone()

Create a cloned copy of the current object and return it. In general the created copy will be a deep copy of the provided instance. As a result this operation an be quite expensive if used incorrectly.

Specified by:

getClone in interface Cloneable

Specified by:

getClone in class ContinuousFunction

Returns:

An exact clone of the current object instance.

See Also:

Object.clone()

getMinimum

public Object getMinimum()

Accessor for the function minimum. This is the minimum value of the function in the given domain.

Overrides:

getMinimum in class ContinuousFunction

Returns:

The minimum function value.

evaluate

public double evaluate(Vector x)

Evaluate the function with the given Vector as input.

Specified by:

evaluate in class ContinuousFunction

Parameters:

x - The input Vector.

Returns:

The value of the evaluation.