# File lib/eymiha/util/histogram.rb, line 36
    def add(key,count=1)
      if key.kind_of? Array
        key.each { |member|
          if member.kind_of? Array
            if member.size == 1
              add(member[0])
            elsif (member.size == 2) && (member[1].kind_of? Fixnum)
              add(member[0],member[1])
            else
              raise HistogramException, "add cannot interpret Array to add"
            end
          else
            add member
          end
        }
      elsif key.kind_of? Histogram
        key.each_pair { |k,v| add(k,v) }
      else
        self[key] = ((value = self[key]) == nil) ? count : value+count
      end
      self
    end