title: subplots in matplotlib using histogram
body: <pre><code>diff  = [[10,20,30],[40,50,60],[70,80,90]]
  comp = ["foo","bar","baz"]
  fig,ax = plt.subplots()
  for foo in range(0, len(diff)):
          x = [diff[foo]]
          name = comp
          color = ['0.1', '0.2', '0.3']
          label = ['1000000','1200000', '1400000']
          y = zip(*x)
          pos = np.arange(len(x))
          width = 1. / (1 + len(x))
  
          fig = plt.subplot(3,1,foo)
          for idx, (serie, color,label) in enumerate(zip(y, color,label)):
                  ax.bar(pos + idx * width, serie, width, color=color,label=label)
          fig = plt.gcf()
          fig.set_size_inches(28.5,10.5)
  
          ax.set_xticks(pos + 1.5*width)
          plt.ylabel(name[foo])
          ax.set_xticklabels(comp)
          ax.legend()
          plt.gray()
  plt.savefig("file" + '.jpg', bbox_inches='tight', pad_inches=0.5,dpi=100)
  plt.clf()
  </code></pre>
  
  <p>I want to subplot <a href="https://stackoverflow.com/a/19965006/2015933"><code>foo bar and baz</code></a>. But when I try to do that using the above code. The data is not being displayed on the graph. Any idea why?</p>