Re: [Cilib-users] mutation for PSO

[Gary P. <gpa...@gm...>]

Hi,

Yes, this is definitely a bug. It should work for Ints as well. I'll 
post a patch for a correction to this issue in a while.

We are currently refactoring quite a bit in the library to make various 
operations / usage issues better, as well as a major update to the 
Javadoc. I'll just need to create a branch to apply the fix.

Would you like the patch posted on the mailing list, or a direct email? 
This will then also be included in the next release.

Thanks for raising this :)

Regards,
Gary

myriam abramson wrote:
> Hello,
> I am trying to evolve integers for an allocation problem, Z(0,20)^10, 
> and I tried to specific MutationPositionUpdateStrategy but unfortunately 
> it does not seem to work for integers. See trace below. Is there a 
> rational for that that I'm missing? I was thinking that instead of 
> evolving a position by incremental velocity changes, mutation would 
> sometimes just produce a new integer. Please let me know if that makes 
> sense. It wouldn't be too hard to implement it on my end.
> 
> Exception in thread "main" java.lang.ClassCastException: 
> net.sourceforge.cilib.type.types.Int 
> <http://net.sourceforge.cilib.type.types.Int> cannot be cast to 
> net.sourceforge.cilib.type.types.Real
>     at 
> net.sourceforge.cilib.pso.positionupdatestrategies.MutationPositionUpdateStrategy.mutate(MutationPositionUpdateStrategy.java:141)
>     at 
> net.sourceforge.cilib.pso.positionupdatestrategies.MutationPositionUpdateStrategy.updatePosition(MutationPositionUpdateStrategy.java:118)
>     at 
> net.sourceforge.cilib.pso.particle.StandardParticle.updatePosition(StandardParticle.java:156)
>     at 
> net.sourceforge.cilib.pso.iterationstrategies.SynchronousIterationStrategy.performIteration(SynchronousIterationStrategy.java:70)
>     at 
> net.sourceforge.cilib.pso.iterationstrategies.SynchronousIterationStrategy.performIteration(SynchronousIterationStrategy.java:36)
>     at net.sourceforge.cilib.pso.PSO.algorithmIteration(PSO.java:125)
>     at 
> net.sourceforge.cilib.algorithm.Algorithm.performIteration(Algorithm.java:140)
>     at net.sourceforge.cilib.algorithm.Algorithm.run(Algorithm.java:182)
>     at 
> mil.navy.nrl.optimization.route.RoutePlanning.run(RoutePlanning.java:142)
>     at 
> mil.navy.nrl.optimization.route.RoutePlanning.main(RoutePlanning.java:192)
> 
> 
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