title: Zeros as missing cases in R
body: <p>I have a csv with millions of cases that look like this:</p>
  
  <pre><code>Case_1,11,17481,172,4436,8,4436
  Case_2,11,1221,680,55200,1776,55200
  Case_3,16,6647,6449,579967,1,579967
  Case_4,22,0,0,0,0,0
  </code></pre>
  
  <p>In this case, <code>Case_4</code> is missing data, since it has a bunch of zeros in it (there are hundreds of these in the file). I'm very new to R, and I was wondering if there is an efficient way of deleting these kinds of missing data from the file? Thanks.</p>