
    <h2>Examples</h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="va">df</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/pkg/data.table/man/data.table.html" class="external-link">data.table</a></span><span class="op">(</span></span></span>
<span class="r-in"><span>  a <span class="op">=</span> <span class="fl">1</span><span class="op">:</span><span class="fl">3</span>,</span></span>
<span class="r-in"><span>  b <span class