title: How to sort and filter data.frame in R?
body: <p>I understand how to sort a data frame:</p>
  
  <p><code>df[order(df$Height),]</code></p>
  
  <p>and I understand how to filter (or subset) a data frame matching some predicate:</p>
  
  <p><code>df[df$Weight &gt; 120,]</code></p>
  
  <p>but how do I sort <em>and</em> filter (as an example, order by Height and filter by Weight)?</p>