Apache Commons Math 3.6.1 · org.apache.commons.math3.genetics.Chromosome

Modifier and Type	Field and Description
private double	fitness Cached value of the fitness of this chromosome.
private static final double	NO_FITNESS Value assigned when no fitness has been computed yet.

Access	Constructor and Description
public	Chromosome()

Method Summary

Modifier and Type	Method and Description
public int	Returns: -1 if `another` is better than `this` 1 if `another` is worse than `this` 0 if the two chromosomes have the same fitness compareTo(final Chromosome another chromosome to compare another) Implements java.lang.Comparable.compareTo. Compares two chromosomes based on their fitness.
protected Chromosome	Returns: Chromosome with the same representation, or `null` if no such chromosome exists. findSameChromosome(final Population Population to search population) Searches the `population` for another chromosome with the same representation.
public double	Returns: the fitness getFitness() Access the fitness of this chromosome.
protected boolean	Returns: true if `another` is equivalent to this chromosome isSame(final Chromosome chromosome to compare another) Returns `true` iff `another` has the same representation and therefore the same fitness.
public void	searchForFitnessUpdate(final Population Population to search population) Searches the population for a chromosome representing the same solution, and if it finds one, updates the fitness to its value.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

fitness	back to summary
private double fitness Cached value of the fitness of this chromosome.

NO_FITNESS	back to summary
private static final double NO_FITNESS Value assigned when no fitness has been computed yet.

Chromosome	back to summary
public Chromosome()

Method Detail

compareTo back to summary

compareTo	back to summary
public int compareTo(final Chromosome another) Implements java.lang.Comparable.compareTo. Compares two chromosomes based on their fitness. The bigger the fitness, the better the chromosome. Parameters another:Chromosome another chromosome to compare Returns:int -1 if `another` is better than `this` 1 if `another` is worse than `this` 0 if the two chromosomes have the same fitness

public int compareTo(final Chromosome another)

Implements java.lang.Comparable.compareTo.

Compares two chromosomes based on their fitness. The bigger the fitness, the better the chromosome.

Parameters

another:Chromosome: another chromosome to compare

Returns:int

-1 if another is better than this
1 if another is worse than this
0 if the two chromosomes have the same fitness

findSameChromosome back to summary

findSameChromosome	back to summary
protected Chromosome findSameChromosome(final Population population) Searches the `population` for another chromosome with the same representation. If such chromosome is found, it is returned, if no such chromosome exists, returns `null`. Parameters population:Population Population to search Returns:Chromosome Chromosome with the same representation, or `null` if no such chromosome exists.

protected Chromosome findSameChromosome(final Population population)

Searches the population for another chromosome with the same representation. If such chromosome is found, it is returned, if no such chromosome exists, returns null.

Parameters

population:Population: Population to search

Returns:Chromosome

Chromosome with the same representation, or null if no such chromosome exists.

getFitness	back to summary
public double getFitness() Access the fitness of this chromosome. The bigger the fitness, the better the chromosome. Computation of fitness is usually very time-consuming task, therefore the fitness is cached. Returns:double the fitness

getFitness

back to summary

public double getFitness()

Access the fitness of this chromosome. The bigger the fitness, the better the chromosome.

Computation of fitness is usually very time-consuming task, therefore the fitness is cached.

Returns:double: the fitness

isSame back to summary

isSame	back to summary
protected boolean isSame(final Chromosome another) Returns `true` iff `another` has the same representation and therefore the same fitness. By default, it returns false -- override it in your implementation if you need it. Parameters another:Chromosome chromosome to compare Returns:boolean true if `another` is equivalent to this chromosome

protected boolean isSame(final Chromosome another)

Returns true iff another has the same representation and therefore the same fitness. By default, it returns false -- override it in your implementation if you need it.

Parameters

another:Chromosome: chromosome to compare

Returns:boolean

true if another is equivalent to this chromosome

searchForFitnessUpdate	back to summary
public void searchForFitnessUpdate(final Population population) Searches the population for a chromosome representing the same solution, and if it finds one, updates the fitness to its value. Parameters population:Population Population to search

searchForFitnessUpdate

back to summary

public void searchForFitnessUpdate(final Population population)

Searches the population for a chromosome representing the same solution, and if it finds one, updates the fitness to its value.

Parameters

population:Population: Population to search

public abstract Class Chromosome

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Method Detail