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Java Source Code / Java Documentation » Development » jgap » examples.knapsack 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.jgap.FitnessFunction
      examples.knapsack.KnapsackFitnessFunction

KnapsackFitnessFunction
public class KnapsackFitnessFunction extends FitnessFunction (Code)
Fitness function for the knapsack example.
author:
   Klaus Meffert
since:
   2.3


Field Summary
final public static  doubleMAX_BOUND
    

Constructor Summary
public  KnapsackFitnessFunction(double a_knapsackVolume)
    

Method Summary
protected  doublecomputeItemNumberPenalty(double a_maxFitness, int a_items)
     Calculates the penalty to apply to the fitness value based on the amount of items in the solution.
public  doubleevaluate(IChromosome a_subject)
     Determine the fitness of the given Chromosome instance.
public static  intgetNumberOfItemsAtGene(IChromosome a_potentialSolution, int a_position)
     Retrieves the number of items represented by the given potential solution at the given gene position.
public static  intgetTotalNumberOfItems(IChromosome a_potentialSolution)
     Returns the total number of items represented by all of the genes in the given potential solution.
public static  doublegetTotalVolume(IChromosome a_potentialSolution)
     Calculates the total amount of change (in cents) represented by the given potential solution and returns that amount.
protected  doublevolumeDifferenceBonus(double a_maxFitness, double a_volumeDifference)
     Bonus calculation of fitness value.

Field Detail
MAX_BOUND
final public static double MAX_BOUND(Code)




Constructor Detail
KnapsackFitnessFunction
public KnapsackFitnessFunction(double a_knapsackVolume)(Code)




Method Detail
computeItemNumberPenalty
protected double computeItemNumberPenalty(double a_maxFitness, int a_items)(Code)
Calculates the penalty to apply to the fitness value based on the amount of items in the solution.
Parameters:
  a_maxFitness - upper boundary for fitness value possible
Parameters:
  a_items - number of items in the solution a penalty for the fitness value based on the number of items
author:
   Klaus Meffert
since:
   2.3



evaluate
public double evaluate(IChromosome a_subject)(Code)
Determine the fitness of the given Chromosome instance. The higher the return value, the more fit the instance. This method should always return the same fitness value for two equivalent Chromosome instances.
Parameters:
  a_subject - the Chromosome instance to evaluate a positive double reflecting the fitness rating of the givenChromosome
author:
   Klaus Meffert
since:
   2.3



getNumberOfItemsAtGene
public static int getNumberOfItemsAtGene(IChromosome a_potentialSolution, int a_position)(Code)
Retrieves the number of items represented by the given potential solution at the given gene position.
Parameters:
  a_potentialSolution - the potential solution to evaluate
Parameters:
  a_position - the gene position to evaluate the number of items represented by the potential solutionat the given gene position
author:
   Klaus Meffert
since:
   2.3



getTotalNumberOfItems
public static int getTotalNumberOfItems(IChromosome a_potentialSolution)(Code)
Returns the total number of items represented by all of the genes in the given potential solution.
Parameters:
  a_potentialSolution - the potential solution to evaluate the total number of items represented by the given Chromosome
author:
   Klaus Meffert
since:
   2.3



getTotalVolume
public static double getTotalVolume(IChromosome a_potentialSolution)(Code)
Calculates the total amount of change (in cents) represented by the given potential solution and returns that amount.
Parameters:
  a_potentialSolution - the potential solution to evaluate the total amount of change (in cents) represented by thegiven solution
author:
   Klaus Meffert
since:
   2.3



volumeDifferenceBonus
protected double volumeDifferenceBonus(double a_maxFitness, double a_volumeDifference)(Code)
Bonus calculation of fitness value.
Parameters:
  a_maxFitness - maximum fitness value appliable
Parameters:
  a_volumeDifference - volume difference in ccm for the items problem bonus for given volume difference
author:
   Klaus Meffert
since:
   2.3



Fields inherited from org.jgap.FitnessFunction
final public static double DELTA(Code)(Java Doc)
final public static double NO_FITNESS_VALUE(Code)(Java Doc)

Methods inherited from org.jgap.FitnessFunction
public Object clone()(Code)(Java Doc)
abstract protected double evaluate(IChromosome a_subject)(Code)(Java Doc)
public double getFitnessValue(IChromosome a_subject)(Code)(Java Doc)
public double getLastComputedFitnessValue()(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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