title: delete the rows in r if it is below the value of the last row at the same column
body: <p>I am beginner in r, and trying to delete all rows, which contain values that are less than the "control" or last row, in each column. For this sample data:</p>
  
  <pre><code>        A   B   C   D    E
  gene1   14  6   8   16  14
  gene2   5   6   10  6   4
  gene3   2   4   6   3   4
  gene4   26  6   18  39  36
  gene5   1   2   3   1   2
  gene6   2   1   3   1   1
  control 8   5   5   4   11
  </code></pre>
  
  <p>I would like to remove all rows that are less than control (including control) leading to:</p>
  
  <pre><code>gene1   14  6   8   16  14
  gene4   26  6   18  39  36
  </code></pre>
  
  <p>Thank you in advance!!
  (sorry, I do not know how to post the question. Hope you could understand what I mean.)</p>