title: Average of values from a column/ Skip lines (textscan)
body: <p>I have a .txt file which looks like this:</p>
  
  <pre><code>******text*******
  (30 lines containing text and *)
  ******text*******
  
  a b c
  a b c
  a b c
  a b c
  a b c
  a b c
  a b c
  </code></pre>
  
  <p>(I'm creating a plot with a as x and b and c as y1 and y2)</p>
  
  <p>How do I skip those 30 lines with textscan? I had this but it didn't work:</p>
  
  <pre><code>[x y1 y2] = textscan('file_name.txt', '%f %f %f', 30);
  </code></pre>
  
  <p>And more: how to I make the average of the values of third column?</p>