title: How to fill empty cells in a column of a matrix with respective row numbers in r?
body: <p>I have double vector that shows up like this:</p>
  <p>P_dol  P_ar    P_st<br />
  2066  1807 1762<br />
  P_he   P_af  P_gr<br />
  969   725  1559<br />
  P_ja   P_ph   P_zi<br />
  1582  1413  1347<br />
  NT     PO<br />
  1087   879   9570</p>
  <p>9463    8822   7541</p>
  <p>5704    5395   5650</p>
  <p>5699    6424   6927</p>
  <p>I would like to fill the empty cells after &quot;PO&quot; with consecutive numbers starting from 120. Any suggestions how to do this in R?</p>