title: R: excluding rows with a preset list of values in a data frame
body: <p>I have a data frame that is very large but very similar to this: </p>
  
  <pre><code>df &lt;- data.frame(Group = rep(c('A', 'B', 'C', 'D'), 50),
                   Number = sample(1:100, 200, replace = T))
  
  Group   Number
  A   52
  B   74
  C   22
  D   90
  A   7
  B   93
  C   50
  D   10
  A   31
  B   19
  </code></pre>
  
  <p>I have another data frame named "remove" that looks like this:</p>
  
  <pre><code>&gt;remove
   Group  Number
      A   52
      C   22
      B   93
      D   10
  </code></pre>
  
  <p>How can I subset the df data so I exclude all rows with the Group and Number values in "remove" to get the following data frame? The file is very large so I would be unable to manually type in the values I want to exclude.
  Desired output:</p>
  
  <pre><code>Group   Number
  B   74
  D   90
  A   7
  C   50
  A   31
  B   19
  </code></pre>
  
  <p>Thanks!</p>