="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">2</span>, <span class="fl">3</span>, <span class="fl">4</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">i</span> <span class="op">&lt;-</span> <span class="fl">2</span>  <span class="co"># Index of the known parameter</span></span></span>
<span class="r-in"><span><span class="va">xi</span> <span class="op">&lt;-</span> <span class="fl">0.5</span>  <span class="