code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true"></a><span class="co"># subassign by reference</span></span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true"></a>flights[hour <span class="op">==</span><span class="st"> </span>24L, hour <span class="op">:</span><span class="er">=</span><span class="st"> </span>0L]</span></code></pre></div>
</div>
<div id="section-5" class="section level4 bs-callout bs-callout-info">
<h4 class="bs-callout bs-callout-info"></h4>
<ul>
<li><p>We