Re: [Cilib-users] matrix representation

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

Hi,

I would actually consider writing a two new classes (one for the
velocity and another for the position).

The only remaining question is how the problem is defined. In the
example you provided, you are using a spherical function. The function
naturally does not understand matrix representations, as per the
definition of the problem.

Let me know if we can help in any way.

Regards,
Gary


lab...@gm... wrote:
> Yes, thanks. I think I can modify the velocityupdatestrategy program to
> handle a matrix representation. It's a tradeoff between doing it like
> that or translating back and forth in other places.
> 
> On Jan 6, 2009 12:13am, Gary Pampara <gpa...@gm...> wrote:
>> Hi,
>>
>>
>>
>> There is absolutely nothing wrong with the XML specification. The
>>
>> problem is in fact with the representation and the current standard
>>
>> classes in CIlib.
>>
>>
>>
>> By default, the larger majority of Swarm Intelligence problems have
>>
>> candidate solutions that are represented by a single vector. In your
>>
>> XML, you have defined that the domain in which the you want the
>>
>> algorithm to operate in, is a space that can effectively be represented
>>
>> as a matrix (or multi-dimensional array).
>>
>>
>>
>> During the algorithm setup and construction, the particles that are
>>
>> generated do in fact have matrices as their internal representations.
>>
>> The problem comes in that the default Velocity and Position update
>>
>> equations expect Vectors and not a Vector of Vectors (which is the
>>
>> current manner a Matrix is built using the domain strings - this may
>>
>> change in the near future).
>>
>>
>>
>> There should be 3 things that need to change.
>>
>> - The particles need to be told that their velocity and position update
>>
>>  equations need to be altered so that they can handle Matrix instances.
>>
>> - The problem needs to be aware that the candidate solution that it
>>
>>  needs to evaluate is in fact a matrix and not a simple Vector class.
>>
>>
>>
>> Does this all make sense?
>>
>>
>>
>> Regards,
>>
>> Gary
>>
>>
>>
>> lab...@gm... wrote:
>>
>> > Sorry, I was on vacation. Happy New Year to all, BTW :-)
>>
>> >
>>
>> > Here's an xml file. Maybe I'm doing something wrong? TIA.
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>> >
>>
>> >
>>
>> >
>>
>> > ]>
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>> > maximumIterations="1000" />
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>> > domain="[R(-5.0,5.0)^5]^5"/>
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>> > resolution="10" samples="1">
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>> > file="data/spherical3.gbest.p20w1.0c1_2c2_2NoVmax.txt"/>
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> > On Dec 23, 2008 6:54am, Gary Pampara gpa...@gm...> wrote:
>>
>> >> Continuing this discussion on the developer list.
>>
>> >>
>>
>> >>
>>
>> >>
>>
>> >> Gary Pampara wrote:
>>
>> >>
>>
>> >> > Hi,
>>
>> >>
>>
>> >> >
>>
>> >>
>>
>> >> > I'll have a look at this.
>>
>> >>
>>
>> >> >
>>
>> >>
>>
>> >> > Regards,
>>
>> >>
>>
>> >> > Gary
>>
>> >>
>>
>> >> >
>>
>> >>
>>
>> >> > lab...@gm... wrote:
>>
>> >>
>>
>> >> >> registry.setDomainString("[R(-5.0, 5.0)^10]^10");
>>
>> >>
>>
>> >> >> yeah, that does not work too well. I get the following error:
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> Exception in thread "main" java.lang.UnsupportedOperationException:
>>
>> >>
>>
>> >> >> Attempted to perform a numeric operation on non-numeric type
>>
>> >>
>>
>> >> >> at
>>
>> >>
>>
>> >> >>
>>
>> >
> net.sourceforge.cilib.type.types.container.Vector.getNumeric(Vector.java:414)
>>
>> >>
>>
>> >> >> at
>>
>> >>
>>
>> >> >>
>>
>> >
> net.sourceforge.cilib.type.types.container.Vector.getReal(Vector.java:466)
>>
>> >>
>>
>> >> >> at
>>
>> >>
>>
>> >> >>
>>
>> >
> net.sourceforge.cilib.pso.velocityupdatestrategies.StandardVelocityUpdate.updateVelocity(StandardVelocityUpdate.java:89)
>>
>> >>
>>
>> >> >> at
>>
>> >>
>>
>> >> >>
>>
>> >
> net.sourceforge.cilib.pso.particle.StandardParticle.updateVelocity(StandardParticle.java:186)
>>
>> >>
>>
>> >> >> at
>>
>> >>
>>
>> >> >>
>>
>> >
> net.sourceforge.cilib.pso.iterationstrategies.SynchronousIterationStrategy.performIteration(SynchronousIterationStrategy.java:69)
>>
>> >>
>>
>> >> >> 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)
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >>
>>
>> > ------------------------------------------------------------------------
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >>
>>
>> >
> ------------------------------------------------------------------------------
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >>
>>
>> > ------------------------------------------------------------------------
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> _______________________________________________
>>
>> >>
>>
>> >> >> Cilib-users mailing list
>>
>> >>
>>
>> >> >> Cil...@li...
>>
>> >>
>>
>> >> >> https://lists.sourceforge.net/lists/listinfo/cilib-users
>>
>> >>
>>
>> >> >
>>
>> >>
>>
>> >> >
>>
>> >
> ------------------------------------------------------------------------------
>>
>> >>
>>
>> >> > _______________________________________________
>>
>> >>
>>
>> >> > Cilib-users mailing list
>>
>> >>
>>
>> >> > Cil...@li...
>>
>> >>
>>
>> >> > https://lists.sourceforge.net/lists/listinfo/cilib-users
>>
>> >>
>>
> 
> 
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