lass="op">(</span><span class="cn">FALSE</span><span class="op">)</span> <span class="op">{</span> <span class="co"># \dontrun{</span></span></span>
<span class="r-in"><span><span class="va">dat</span> <span class="op">&lt;-</span></span></span>
<span class="r-in"><span>  <span class="va">iris</span><span class="op">[</span>, <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"Sepal.Length"</span>, <span class="st">"Sepal.Widt