title: Use the same colorbar for different subplots in matplotlib
body: <p>I am plotting different figure in subplots using the following procedure.</p>
  
  <pre><code>fig = figure(figsize=(10,11))
  subplots_adjust(wspace=0.5,hspace=0.2)
  iplot = 330
  for i in range(9):
      iplot += 1
      ax = fig.add_subplot(iplot)
      ## Comparison Mreal - Real
      tmp = REAL[REAL.days==days[i]]
      tmp = tmp.score
      tmp = np.array(tmp)
      tmp = tmp.reshape(len(xv), len(br))
      im = plt.imshow(tmp, interpolation='nearest', cmap='gnuplot', vmin = 0, vmax = 1,  extent=[0.05,0.5,1,0.05],
                aspect=0.5)
      xtmp = [0.05, 0.2, 0.3, 0.4, 0.5]
      plt.xticks(xtmp)
      ytmp = [0.05, 0.2, 0.4, 0.6, 0.8, 1.0]
      plt.yticks(ytmp)
      ax.grid(False)
  divider = make_axes_locatable(plt.gca())
  cax = divider.append_axes("right", "5%", pad="3%")
  plt.colorbar(im, cax=cax)
  plt.tight_layout()
  </code></pre>
  
  <p>and this is what I get:</p>
  
  <p><a href="https://i.stack.imgur.com/ntC9y.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ntC9y.png" alt="enter image description here"></a></p>
  
  <p>However I would like to have the same colorbar for all the subplots, for istance on the right side of the figure.</p>