[PD] Flock of birds

[B. Bogart]

Heya,

If anyone has some sample code for a flock of birds I may take a crack
at that. It is also a behavoir I think would be very interesting to use.

The difference between a "normal" flocking algo and the PSO as follows:

#1. As Jamie mentioned the PSO is trying to solve problems, not just
look interesting. It is in the class of evelutionary algos that find
solutions to problems, this one based on the diversity of its
populations and "fitness"

#2. You CANNOT change the target of the PSO as it is evolving. Well you
can, but the population will not nessesarily find the new target. What
tends to happen is you get a cluster of particles gravitating around the
original target, and a new set stuck around the new one. The system
never optimizes.

So if you want to "flock" to a fixed target, wait for optimization (all
particles end up on the same point), then define a new target and
re-randomize the population than the PSO may work for you.

If there are any PSO experts on the list I would be interested in newer
PSO algos that:

A. Can deal with moving targets
B. Will be able to find multiple solutions (particles optimize on
multiple points)

B>

Jamie Bullock wrote:
> The PSO (Particle Swarm Optimizer) object by Ben Bogart kind of does
> this. It can be found in the CVS under externals/bbogart/pso. It is
> really designed for solving optimisation problems, but it is based on
> the biological model of a flocking behaviour. You set a target as an n-
> dimensional vector and n solutions will "flock" through the space
> following their neighbours and the optimal solution.
>
> Jamie
>
> On Thu, 2005-05-05 at 19:42 -0400, Thomas Ouellet Fredericks wrote:
>
>>I would like to know if anyone has any suggestions on how to get a
>>"flock of birds" behavior in Pure Data on XP? No the graphics, just
>>the positions.
>>
>>Tom
>>
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