title: Select rows from a data frame where any variable is not NA
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/6437164/removing-empty-rows-of-a-data-file-in-r">Removing empty rows of a data file in R</a>  </p>
  </blockquote>
  
  
  
  <p>Suppose I have a dataframe <code>df</code></p>
  
  <p>I would like to select the rows from it, where any of the variables in the row are not <code>NA</code>. That is to say I only want to exclude the rows in which <strong>all</strong> the variables are <code>NA</code></p>