ss="downlit sourceCode r">
<code class="sourceCode R"><span><span class="va">flights.grp</span><span class="op">[[</span><span class="st">"wind_dir"</span><span class="op">]</span><span class="op">]</span> <span class="op">&lt;-</span> <span class="va">weather_wind_dir</span></span></code></pre></div>
<p>and</p>
<div class="sourceCode" id="cb8"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="va">weather_wind_speed</span> <span class="op">&lt;-</span> <span class="fu"><a href