d <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"nlminb"</span>, <span class="st">"L-BFGS-B"</span><span class="op">)</span>,</span>
<span>    subset <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">195</span>, <span class="fl">40</span><span class="op">)</span></span>
<span>  <span class