bers instead of names in the <code>LHS</code>, although it is good programming practice to use column names.</p></li>
<li><p>When there is just one column to delete, we can drop the <code>c()</code> and double quotes and just use the column name <em>unquoted</em>, for convenience. That is:</p>
<div class="sourceCode" id="cb12"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true"></a>flights[, delay <span class="op">:</span><span class="er">=</span><span