title: %matplotlib inline does not show any plot on jupyter notebook
body: <p><code>matplotlib.pyplot</code> takes a long time to run and finally no plot shows on the screen</p>
  
  <p>But <code>matplotlib.back_end()</code> gives the following</p>
  
  <pre><code>u'TkAgg'
  </code></pre>
  
  <p>Can someone suggest a solution?</p>
  
  <p>NOTE: I installed matplotlib using <code>pip install matplotlib</code></p>