e class="sourceCode r"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true"></a>DF<span class="op">$</span>c &lt;-<span class="st"> </span><span class="dv">18</span><span class="op">:</span><span class="dv">13</span>               <span class="co"># (1) -- replace entire column</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true"></a><span class="co"># or</span></span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true"></a>DF<span class="op">$</span>c[DF<span class="op">$</span>ID <span clas