Re: [Cilib-users] matrix representation

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

The other option is of course to convert to a matrix first and then do
the multiplication?

Many ways to skin a cat :P Just let us know how we can help.

Regards,
Gary

lab...@gm... wrote:
> yes, that's true. I was just trying with an existing function. It might
> be better to just do the translation from a simple vector when I need it
> and leave the rest as is. I was concerned with matrix multiplication but
> there is only scalar multiplication in the update equations for PSO so
> the matrix representation does not matter after all. I'm trying to do a
> task assignment problem and that's nice to do with matrices.
> 
> 
> On Jan 7, 2009 12:15am, Gary Pampara <gpa...@gm...> wrote:
>> 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
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>> 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.
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>> >
>>
>> > On Jan 6, 2009 12:13am, Gary Pampara gpa...@gm...> wrote:
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>> >> Hi,
>>
>> >>
>>
>> >>
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>> >>
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>> >> There is absolutely nothing wrong with the XML specification. The
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>> >>
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>> >> problem is in fact with the representation and the current standard
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>> >>
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>> >> classes in CIlib.
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>> >>
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>> >>
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>> >>
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>> >> By default, the larger majority of Swarm Intelligence problems have
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>> >>
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>> >> candidate solutions that are represented by a single vector. In your
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>> >>
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>> >> XML, you have defined that the domain in which the you want the
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>> >>
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>> >> algorithm to operate in, is a space that can effectively be represented
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>> >>
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>> >> as a matrix (or multi-dimensional array).
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>> >>
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>> >>
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>> >>
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>> >> During the algorithm setup and construction, the particles that are
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>> >>
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>> >> generated do in fact have matrices as their internal representations.
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>> >>
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>> >> The problem comes in that the default Velocity and Position update
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>> >>
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>> >> equations expect Vectors and not a Vector of Vectors (which is the
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>> >>
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>> >> current manner a Matrix is built using the domain strings - this may
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>> >>
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>> >> change in the near future).
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>> >>
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>> >>
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>> >>
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>> >> There should be 3 things that need to change.
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>> >>
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>> >> - The particles need to be told that their velocity and position update
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>> >>
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>> >>  equations need to be altered so that they can handle Matrix instances.
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>> >>
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>> >> - The problem needs to be aware that the candidate solution that it
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>> >>
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>> >>  needs to evaluate is in fact a matrix and not a simple Vector class.
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>> >>
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>> >>
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>> >>
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>> >> Does this all make sense?
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>> >>
>>
>> >>
>>
>> >>
>>
>> >> Regards,
>>
>> >>
>>
>> >> Gary
>>
>> >>
>>
>> >>
>>
>> >>
>>
>> >> lab...@gm... wrote:
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>> >>
>>
>> >> > Sorry, I was on vacation. Happy New Year to all, BTW :-)
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>> >>
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>> >> >
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>> >>
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>> >> > Here's an xml file. Maybe I'm doing something wrong? TIA.
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>> >>
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>> >> >
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>> >> >
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>> >> >
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>> >> >
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>> >> >
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>> >> > ]>
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>> >> >
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>> >> >
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>> >> >
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>> >>
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>> >> >
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>> >> >
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>> >> > maximumIterations="1000" />
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >> > domain="[R(-5.0,5.0)^5]^5"/>
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >> > resolution="10" samples="1">
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>> >> >
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>> >>
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>> >> >
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>> >> > file="data/spherical3.gbest.p20w1.0c1_2c2_2NoVmax.txt"/>
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> >
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>> >>
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>> >> > On Dec 23, 2008 6:54am, Gary Pampara gpa...@gm...> wrote:
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>> >>
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>> >> >> Continuing this discussion on the developer list.
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>> >>
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>> >> >>
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>> >>
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>> >> >>
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>> >>
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>> >> >>
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>> >>
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>> >> >> Gary Pampara wrote:
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>> >>
>>
>> >> >>
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>> >>
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>> >> >> > Hi,
>>
>> >>
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>> >> >>
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>> >>
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>> >> >> >
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>> >>
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>> >> >>
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>> >>
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>> >> >> > I'll have a look at this.
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>> >>
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>> >> >>
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>> >>
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>> >> >> >
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>> >>
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>> >> >>
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>> >>
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>> >> >> > Regards,
>>
>> >>
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>> >> >>
>>
>> >>
>>
>> >> >> > Gary
>>
>> >>
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>> >> >>
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>> >>
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>> >> >> >
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>> >>
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>> >> >>
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>> >>
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>> >> >> > lab...@gm... wrote:
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>> >>
>>
>> >> >>
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>> >>
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>> >> >> >> registry.setDomainString("[R(-5.0, 5.0)^10]^10");
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>> >>
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>> >> >>
>>
>> >>
>>
>> >> >> >> yeah, that does not work too well. I get the following error:
>>
>> >>
>>
>> >> >>
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>> >>
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>> >> >> >>
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>> >>
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>> >> >>
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>> >>
>>
>> >> >> >> Exception in thread "main"
> java.lang.UnsupportedOperationException:
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>> >>
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>> >> >>
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>> >>
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>> >> >> >> Attempted to perform a numeric operation on non-numeric type
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>> >>
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>> >> >>
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>> >>
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>> >> >> >> at
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>> >>
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>> >> >>
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>> >>
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>> >> >> >>
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>> >>
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>> >> >
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>> >
> net.sourceforge.cilib.type.types.container.Vector.getNumeric(Vector.java:414)
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>> >>
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>> >> >>
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>> >>
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>> >> >> >> at
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>> >>
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>> >> >>
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>> >>
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>> >> >> >>
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>> >>
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>> >> >
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>> >
> net.sourceforge.cilib.type.types.container.Vector.getReal(Vector.java:466)
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>> >>
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>> >> >>
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>> >>
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>> >> >> >> at
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>> >>
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>> >> >>
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>> >>
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>> >> >> >>
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>> >>
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>> >> >
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>> >
> net.sourceforge.cilib.pso.velocityupdatestrategies.StandardVelocityUpdate.updateVelocity(StandardVelocityUpdate.java:89)
>>
>> >>
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>> >> >>
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>> >>
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>> >> >> >> at
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>> >>
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>> >> >>
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>> >>
>>
>> >> >> >>
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>> >>
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>> >> >
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>> >
> net.sourceforge.cilib.pso.particle.StandardParticle.updateVelocity(StandardParticle.java:186)
>>
>> >>
>>
>> >> >>
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>> >>
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>> >> >> >> at
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>> >>
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>> >> >>
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>> >>
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>> >> >> >>
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>> >>
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>> >> >
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>> >
> net.sourceforge.cilib.pso.iterationstrategies.SynchronousIterationStrategy.performIteration(SynchronousIterationStrategy.java:69)
>>
>> >>
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>> >> >>
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>> >>
>>
>> >> >> >> at
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>> >>
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>> >> >>
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>> >>
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>> >> >> >>
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>> >>
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>> >> >
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>> >
> net.sourceforge.cilib.pso.iterationstrategies.SynchronousIterationStrategy.performIteration(SynchronousIterationStrategy.java:36)
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> >> at net.sourceforge.cilib.pso.PSO.algorithmIteration(PSO.java:125)
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>> >>
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>> >> >>
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>> >>
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>> >> >> >> at
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>> >>
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>> >> >>
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>> >>
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>> >> >> >>
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>> >>
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>> >> >
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>> >
> net.sourceforge.cilib.algorithm.Algorithm.performIteration(Algorithm.java:140)
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>> >>
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>> >> >>
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>> >>
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>> >> >> >> at
> net.sourceforge.cilib.algorithm.Algorithm.run(Algorithm.java:182)
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>> >>
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>> >> >>
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>> >> >> >>
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>> >> >>
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>> >> >> >>
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>> >> >>
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>> >> >> >>
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>> >> >
> ------------------------------------------------------------------------
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>> >> >> >>
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>> >
> ------------------------------------------------------------------------------
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>> >>
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>> >> >>
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>> >> >
> ------------------------------------------------------------------------
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>> >>
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>> >> >>
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>> >> >> >>
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>> >> >>
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>> >>
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>> >> >> >> _______________________________________________
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> >> Cilib-users mailing list
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> >> Cil...@li...
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> >> https://lists.sourceforge.net/lists/listinfo/cilib-users
>>
>> >>
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>> >> >>
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>> >>
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>> >> >> >
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>> >>
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>> >> >>
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>> >> >> >
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>> >> >
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>> >
> ------------------------------------------------------------------------------
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> > _______________________________________________
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> > Cilib-users mailing list
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> > Cil...@li...
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> > https://lists.sourceforge.net/lists/listinfo/cilib-users
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >
>>
>> >
>>
>> > ------------------------------------------------------------------------
>>
>> >
>>
>> >
> ------------------------------------------------------------------------------
>>
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>>
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>> >
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>> > ------------------------------------------------------------------------
>>
>> >
>>
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>>
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