title: Only list objects in class data.frame
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/5158830/identify-all-objects-of-given-class-for-further-processing">Identify all objects of given class for further processing</a>  </p>
  </blockquote>
  
  
  
  <p>I want to build an index of every data frame I have in my workspace. How do I write something sounding like:</p>
  
  <pre><code>dindex &lt;- ls(class=data.frame)
  </code></pre>