e>.</p>
</div>
<div id="c-delete-column-by-reference" class="section level3">
<h3>c) Delete column by reference</h3>
<div id="remove-delay-column" class="section level4">
<h4>– Remove <code>delay</code> column</h4>
<div class="sourceCode" id="cb11"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true"></a>flights[, <span class="kw">c</span>(<span class="st">&quot;delay&quot;</span>) <span class="op">:</span><span class="er">=</span><span class="st"> </