title: Read data from text file and sort into a vector
body: <p>I have a data file like so ...</p>
  
  <pre><code>Control,3
  Test,3
  Control,3
  Control,3
  Test,1
  Control,3
  Control,1
  </code></pre>
  
  <p>I want to load them into 2 vectors test and control.
  Any ideas?</p>