w data.frame</span></span>
<span><span class="fu">a_point</span><span class="op">(</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>x <span class="op">=</span> <span class="fl">1</span>, y <span class="op">=</span> <span class="fl">2</span><span class="op">)</span> <span class="op">)</span></span>
<span><span class="co">#       [,1] [,2]</span></span>
<span><span class="co">#  [1,]    1    2</span></span>
<span><span