an><span class="op">(</span><span class="va">d</span><span class="op">)</span></span></code></pre></div>
<pre><code><span><span class="co">##   names x  y</span></span>
<span><span class="co">## 1     a 1  1</span></span>
<span><span class="co">## 2     b 2  4</span></span>
<span><span class="co">## 3     c 3  9</span></span>
<span><span class="co">## 4     d 4 16</span></span></code></pre>
<p>Notice how the table is specified by columns (which is close to how
<code>data.frame</code>s are implemented), but 