R - Remove blanks from data frame : <p>An example of the data frame I have is:</p>

<pre><code>Index  TimeDifference
1        
2         
3            20
4      
5            67
</code></pre>

<p>I want to delete all rows that are blank (these are blank and NOT na). Hence the following data frame I want is:</p>

<pre><code>Index     TimeDifference
3               20
5               67
</code></pre>

<p>Thanks</p>
