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Hi,

I'm going to check the ES package and try it. Adjoining is the
backtrace (I'm using GNU/Linux with jre 1.6)

Daniel


| ECJ
| An evolutionary computation system (version 18)
| By Sean Luke
| Contributors: L. Panait, G. Balan, S. Paus, Z. Skolicki, R.
Kicinger, E. Popovici,
|               J. Harrison, J. Bassett, R. Hubley, A. Desai, and A. Chircop
| URL: http://cs.gmu.edu/~eclab/projects/ecj/
| Mail: [log in to unmask]
|       (better: join ECJ-INTEREST at URL above)
| Date: June 23, 2008
| Current Java: 1.6.0_0 / OpenJDK Server VM-1.6.0_0-b11
| Required Minimum Java: 1.3


Threads:  breed/1 eval/1
Seed: 4357
Job: 0
Setting up
Processing GP Types
Processing GP Node Constraints
Processing GP Function Sets
Processing GP Tree Constraints
Initializing Generation 0
Subpop 0 best fitness of generation: Fitness: Raw=24.0 Adjusted=0.04 Hits=40
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 18
	at ec.gp.koza.CrossoverPipeline.produce(CrossoverPipeline.java:422)
	at ec.breed.MultiBreedingPipeline.produce(MultiBreedingPipeline.java:130)
	at ec.simple.SimpleBreeder.breedPopChunk(SimpleBreeder.java:182)
	at ec.simple.SimpleBreeder.breedPopulation(SimpleBreeder.java:119)
	at ec.simple.PlagueSimpleBreeder.breedPopulation(PlagueSimpleBreeder.java:25)
	at ec.simple.SimpleEvolutionState.evolve(SimpleEvolutionState.java:119)
	at ec.EvolutionState.run(EvolutionState.java:371)
	at ec.Evolve.main(Evolve.java:648)


On Mon, Oct 20, 2008 at 3:02 PM, Sean Luke <[log in to unmask]> wrote:
> I'm sorry Daniel, I can't do much here without the full stack backtrace
> printed out, not just the exception.  Can you provide that?
>
> At any rate, nowhere should ECJ be relying on initial population size
> conditions: that would definitely be a bug.  Populations can and do resize
> themselves: in fact I have an entire paper relying on that fact.
>  (http://www.cs.bham.ac.uk/~wbl/biblio/gp-html/luke_2003_gecco.html) And the
> ES package does it as a matter of course.
>
> Sean
>
> Daniel Lombraña González wrote:
>>
>> Hi to all,
>>
>> I'm trying to use ECJ with GP and dynamic populations. I have been
>> searching in the mailing list and I found the following conversation:
>>
>> https://listserv.gmu.edu/cgi-bin/wa?A2=ind0404&L=ECJ-INTEREST-L&P=R72&I=-3
>>
>> I have tried that solution, but I get an error when the
>> CrossoverPipeline tries to create two new offsprings. The obtained
>> error is the following one:
>>
>> Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 18
>>
>> It seems that the variable "q" is getting out of the bound in the inds
>> array. I don't know how to fix this. It seems that the problem relies
>> on the initial population length = 20, which is not varied at all
>> during the evolution.
>>
>> Any ideas?
>>
>> PS: By the way, if using the proposed solution you increase the size
>> of the subpopulation you get an error because ECJ tries to compute the
>> fitness of a null individual :)
>>
>> --
>>
>> ··························································································································································
>> PhD Candidate
>> Cátedra Ceta-Ciemat de la Universidad de Extremadura
>> http://gea.unex.es/catedra-ceta-ciemat/
>> Universidad de Extremadura
>>
>> ··························································································································································
>> Por favor, NO utilice formatos de archivo propietarios para el
>> intercambio de documentos, como DOC y XLS, sino HTML, RTF, TXT, CSV
>> o cualquier otro que no obligue a utilizar un programa de un
>> fabricante concreto para tratar la información contenida en él.
>>
>> ··························································································································································
>>
>>
>>
>



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PhD Candidate
Cátedra Ceta-Ciemat de la Universidad de Extremadura
http://gea.unex.es/catedra-ceta-ciemat/
Universidad de Extremadura
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Por favor, NO utilice formatos de archivo propietarios para el
intercambio de documentos, como DOC y XLS, sino HTML, RTF, TXT, CSV
o cualquier otro que no obligue a utilizar un programa de un
fabricante concreto para tratar la información contenida en él.
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