class="external-link">data.frame</a></span><span class="op">(</span>a<span class="op">=</span><span class="fl">1</span><span class="op">:</span><span class="fl">3</span>, b<span class="op">=</span><span class="fl">4</span><span class="op">:</span><span class="fl">6</span><span class="op">)</span>, <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"something"</span>, <span class="st">"data.frame"</span><span class="op">)</span