title: dplyr filter by the first column
body: <p>Is it possible to <code>filter</code> in <code>dplyr</code> by the position of a column?</p>
  
  <p>I know how to do it without <code>dplyr</code></p>
  
  <p><code>iris[iris[,1]&gt;6,]</code></p>
  
  <p>But how can I do it in dplyr?</p>
  
  <p>Thanks!</p>