title: Matplotlib - scatter on top of regular plot
body: <p>I have this:</p>
  
  <pre><code> fig = plt.subplot2grid((count, count), (i, 0), rowspan=1, colspan=count)
   fig.plot(x, y, label='trup')
  </code></pre>
  
  <p>I also want to scatter another time series, on the same figure, with the same axes and scale, something like</p>
  
  <pre><code>fig.scatter(x2, y2, label='scatter')
  </code></pre>
  
  <p>How do I do this?</p>
  
  <p>Edit: This works, but I am getting 2 different pairs of axes:</p>
  
  <pre><code>fig = plt.subplot2grid((1, 1), (0, 0), rowspan=1, colspan=count)
  fig.plot(x,y)
  plt.scatter(u, v)
  </code></pre>
  
  <p>How do I make sure they are on the same exact axis?</p>