title: Trying to find movies without directors in a ds on R
body: <p>this is the code im trying to run to find rows where director is not equal to <code>NA</code>:</p>
  <pre class="lang-r prettyprint-override"><code>nodir &lt;- subset(x, director==&quot;NA&quot;,
                      select = c(titles))
  </code></pre>