ltiple_columns()</code> function.</p>
<div class="sourceCode" id="cb402"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb402-1"><a href="loops.html#cb402-1" tabindex="-1"></a><span class="co"># Recreating our dataset</span></span>
<span id="cb402-2"><a href="loops.html#cb402-2" tabindex="-1"></a>city <span class="ot">&lt;-</span> <span class="fu">data.frame</span>(</span>
<span id="cb402-3"><a href="loops.html#cb402-3" tabindex="-1"></a>  <span class="at">porto =</span> <span class="fu">rno