title: How do I delete rows in a data frame?
body: <p>I have a data frame named "mydata" that looks like this this: <br/></p>
  
  <pre><code>   A  B  C   D 
  1. 5  4  4   4 
  2. 5  4  4   4 
  3. 5  4  4   4 
  4. 5  4  4   4 
  5. 5  4  4   4 
  6. 5  4  4   4 
  7. 5  4  4   4 
  </code></pre>
  
  <p>I'd like to delete row 2,4,6. For example, like this:</p>
  
  <pre><code>   A  B  C   D
  1. 5  4  4  4 
  3. 5  4  4  4 
  5. 5  4  4  4 
  7. 5  4  4  4 
  </code></pre>