R2 column,</span></span></span>
<span class="r-in"><span>  <span class="co"># want to show this is caught</span></span></span>
<span class="r-in"><span>  <span class="va">d</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>z <span class="op">=</span> <span class="fl">1</span><span class="op">)</span></span></span>
<span class="r-in"><span>  <span class="kw"><a href="https://rdrr.io/r/base