return 0;
double maxDistance = 0.0;  Particle swarmBestParticle = getBestParticle(); Vector swarmBestParticlePosition = (Vector)swarmBestParticle.getPosition();  Iterator swarmIterator = getTopology().iterator();  while(swarmIterator.hasNext()) { Particle swarmParticle = (Particle)swarmIterator.next(); Vector swarmParticlePosition = (Vector)swarmParticle.getPosition();  DistanceMeasure distanceMeasure = new EuclideanDistanceMeasure(); double actualDistance = distanceMeasure.distance(swarmBestParticlePosition, swarmParticlePosition);  if(actualDistance > maxDistance) maxDistance = actualDistance; }  return maxDistance;
    public double getRadius() {    	return 0;    }