an><span class="op">(</span><span class="fl">1</span><span class="op">:</span><span class="fl">2</span>, each <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/length.html" class="external-link">length</a></span><span class="op">(</span><span class="va">x</span><span class="op">)</span><span class="op">)</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>                 x <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/rep.html" class