title: Removing a particular category from a data frame in R
body: <p>I have a single column in a data frame in R that looks something like this:</p>
  
  <pre><code>blue
  green
  blue
  yellow
  black
  blue
  green
  </code></pre>
  
  <p>How do I remove all the rows that indicate <strong>blue</strong>? Please keep in mind that I don't want a NULL value represented in that row: I want the entire row removed.</p>
  
  <p>Thank you :)</p>