ass="r-in"><span><span class="va">df</span> <span class="op">&lt;-</span> <span class="va">iris</span><span class="op">[</span>, <span class="fl">1</span><span class="op">:</span><span class="fl">4</span><span class="op">]</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/names.html" class="external-link">names</a></span><span class="op">(</span><span class="va">df</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rd