title: R: Average value of vector
body: <p>I'm playing around with R and trying to get the average of a column.  Just <code>mean(V1)</code> doesn't work.</p>
  
  <p><img src="https://i.stack.imgur.com/AL8Ft.png" alt="enter image description here"></p>
  
  <p>Could anybody give me an advice?<br>
  Thank you!</p>