><span class="va">y12</span>, <span class="va">y22</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">mfdobj</span> <span class="op">&lt;-</span> <span class="fu">get_mfd_df</span><span class="op">(</span>dt <span class="op">=</span> <span class="va">df</span>,</span></span>
<span class="r-in"><span>                     domain <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html