n class="op">]</span> <span class="op">&lt;-</span> <span class="fu">datasets</span><span class="fu">::</span><span class="va"><a href="https://rdrr.io/r/datasets/mtcars.html" class="external-link">mtcars</a></span></span>
<span><span class="va">flights.grp</span><span class="op">[[</span><span class="st">"weather"</span><span class="op">]</span><span class="op">]</span> <span class="op">&lt;-</span> <span class="fu">nycflights13</span><span class="fu">::</span><span class="va"><a href="https://rdrr.io/pkg/