title: Open and plot multiple files
body: <p>I have multiple files of this type (same number of columns, different rows)</p>
  
  <pre><code>A     1      1   1   43.50   12.50   
  A     1      1   5   44.50   12.50   
  A     1      1   9   44.50   12.50   
  A     1      1   13      45.50   12.50   
  A     1      1   17      45.50   12.50  
  A     1      1   21      46.50   12.50   
  A     1      2   1   47.50   12.50   
  A     1      2   5   47.50   12.50   
  A     1      2   9   48.50   12.50 
  </code></pre>
  
  <p>I would like to open all those files and plot for every one the last two columns. I managed to open them using <code>lapply</code> </p>
  
  <pre><code>myfiles &lt;- list.files(pattern="*.dat")
  myfilesContent &lt;- lapply(myfiles, read.table, header=T, sep = "\t")
  </code></pre>
  
  <p>but then I am stack..</p>
  
  <p>Many thanks!</p>