/span> <span class="fl">60</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
<p>If you only want to keep the new variables, use
<code><a href="../reference/mutate.html">transmute_dt()</a></code>:</p>
<div class="sourceCode" id="cb11"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="fu"><a href="../reference/mutate.html">transmute_dt</a></span><span class="op">(</span><span class="va">flights</span>,</span>
<span>  gain <span class="op">=</span