gistfile1.rb

        aggregates = d.map {|a| a['_id'] || 0}
        # get min/max and range
        min = aggregates.min.to_f
        max = aggregates.max.to_f
        range = (max - min) / 8
        index = 0
        copied = d.clone
        bins = (min..max).step(range).inject([]){|memo, num| memo << {"_id"=> num, metric_name => []}}
        new_range = bins.map do |item|
          more = item['_id']
          less = bins[index + 1]['_id'] rescue nil 

          matches = copied.reject{|d| !d['_id']}.select do |i|
            if(less)
              i['_id'].to_i >= more && i['_id'].to_i <= less
            else
              i['_id'] >= more
            end
          end

          matches.each do |match|
            item[metric_name] << match[metric_name]
            item['last_id'] = match['last_id']
            item[metric_name] = item[metric_name].flatten
          end

          index = index + 1
          puts item.inspect
          item
        end
        new_range