[jgap-users] PreserveFittestIndividual not working

[Paolo P. <p.p...@gm...>]

Dear jgap users, I'm developing an application using jgap and using the
following configuration:

Breeder: org.jgap.impl.GABreeder
ChromosomeSize: 80
MinimumPopSizePercent: 100
PopulationSize: 50
NaturalSelectors (before genetic operators):
NaturalSelectors (after genetic operators):
       org.jgap.impl.WeightedRouletteSelector
GeneticOperators:
       org.jgap.impl.CrossoverOperator
       org.jgap.impl.MutationOperator
FitnessEvaluator: org.jgap.DefaultFitnessEvaluator
FitnessFunction: it.poliba.synbio.ambient.jgap.GenotypeToPhenotype
SelectFromPrevGen: 0.2
AlwaysCalculateFitness: false
KeepPopulationSizeConstant: true
PreserveFittestIndividual: true

Unexpectedly the fittest individual is not preserved between
populations (I can observe reduction of fitness of fittest individual
in the next population). My fitness is between 0 (worst) and 1 (best).
What can I do to preserve the fittest individual?

BR, Paolo

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