</span><span class="op">(</span><span class="va">dep_delay</span><span class="op">&gt;</span><span class="fl">0</span>, <span class="va">arr_delay</span><span class="op">&gt;</span><span class="fl">0</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
<p>Now let’s try a more complex example:</p>
<div class="sourceCode" id="cb25"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="co"># data.table</span></span>
<span><span class="va">flights</span