December 2016


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Enzo Fabbiani <[log in to unmask]>
Reply To:
ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Thu, 29 Dec 2016 18:08:53 -0300
text/plain (1715 bytes) , text/html (3702 bytes)

I was able to get access to problem information by adding those sentence in
my code in the reset function (not setup), but I'm getting null pointer
exception when trying to retrieve the Species object.

2016-12-28 21:54 GMT-03:00 Eric 'Siggy' Scott <[log in to unmask]>:

> Enzo,
> Were you able to solve your problem?  Or could you still use assistance?
> The usual way to access information in another class when initializing an
> object in ECJ is to use the global EvolutionState object to walk through
> the program's state and find what you want.
> So, in the 'setup()' method of your BusProblemLine class, you would
> retrieve the Species object with something like this:
> final GeneVectorSpecies species = (GeneVectorSpecies)
> state.population.subpops[0].species;
> On Mon, Dec 19, 2016 at 9:11 AM, Enzo Fabbiani <[log in to unmask]>
> wrote:
>> Hi there, I'm facing some trouble when trying to initialize population.
>> My custom class BusProblemLine (which extends from Gene) implements reset
>> function.
>> In order to do that, some problem information is needed. This info is
>> read from files and loaded into atributes in the setup function in
>> GeneVectorSpecies and can be accessed from evaluate function in my problem
>> class.
>> How can I access to this information in BusProblemLine to initialize the
>> population (as well as mutate and crossover).
>> I've tried to read data in the reset function but it explodes for out of
>> memory. What is more, it gets initializing more times than the population
>> size, is this ok?
>> Regards,
>> Enzo
> --
> Ph.D student in Computer Science, George Mason University
> CFO and Web Director, Journal of Mason Graduate Research