pan>
<span><span class="co">#  1  1 1, 2, 3, 4, 5, 6</span></span>
<span><span class="co">#  2  2 4, 5, 6, 7, 8, 9</span></span>
<span></span>
<span><span class="va">x</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>x <span class="op">=</span> <span class="fl">1</span><span class="op">:</span><span class="fl">6</span>, y <span class="op">=</span> <span class="fl">4</span><span class="op