 <span class="st">"c"</span><span class="op">)</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>  num <span class="op">=</span> <span class="fl">1</span><span class="op">:</span><span class="fl">3</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Automatically does all character/factor columns</span></span></span>
<span class="r-in"><span><span class="va">df</span> <