title: Pandas : Find which index in array is equals to last element of other array
body: <p>I have two columns with arrays which are generated from two others</p>
  <pre><code>mf['FV_array'] = mf['FV'].str.split()
  mf['MT_array'] = mf['MT'].str.split()
  </code></pre>
  <p>and now what i am tryin to do is find which <code>mf['MT_array']</code> index in every row is equals to last index in every <code>mf['FV_array']</code>, a lot of my probes with index function did not work.</p>
  <p>Example what i would like to do :</p>
  <pre><code>FV_array                                |   MT_array     |  Result
  
  ['Something','John','Doe','is','there']   ['John','Doe']      2
  </code></pre>
  <p>Thank you in advance for help!</p>