# File lib/pso.rb, line 66
  def roam
    gbest = @pso.global_best_vector
    @vector_size.times do |i|
      c = @vector[i]
      pbest = @best_vector[i]
      @vector[i] = c + 2 * rand * pbest - c + 2 * rand * gbest[i] - c
    end
  end