# File lib/ai4r/classifiers/prism.rb, line 173
      def better_pt(pt, best_pt)
        return false if pt[1] == 0
        return true if best_pt[1] == 0
        a = pt[0]*best_pt[1]
        b = best_pt[0]*pt[1]
        return true if a>b || (a==b && pt[0]>best_pt[0])
        return false
      end