# File lib/ai4r/clusterers/clusterer.rb, line 36
      def euclidean_distance(a, b)        
        dist = 0.0
        a.each_index do |index|
          if a[index].is_a?(Numeric) && b[index].is_a?(Numeric)
            dist = dist + ((a[index]-b[index])*(a[index]-b[index]))
          end
        end
        return dist
      end