title: Aspect ratio of a plot
body: <p>I try to change my aspect ratio in python. I know this has been discussed in many other cases (e.g. with figaspect), but I don't get it like I want to have it. If I use figaspect, I get the error:</p>
  
  <p><code>'Figure' object is not callable</code>.</p>
  
  <p>Without it I have this code:</p>
  
  <pre><code>fig, ax = plt.subplots()
  
  ax.plot(y_test1, linewidth=0.5, linestyle="-", label='Test1')
  ax.plot(y_test2, linewidth=0.5, linestyle="-", label='Test2') 
  legend = ax.legend(loc='right center',prop={'size': 5}, shadow=True, fontsize='medium')
  plt.xlabel('images')
  plt.ylabel('error')
  plt.grid()
  plt.axis([0,100, 0, 20])
  </code></pre>
  
  <p>It works, but I need an other aspect ratio. How do I get a plot that is three times wider than high? </p>