       id <span class="op">=</span> <span class="st">"id"</span>,</span></span>
<span class="r-in"><span>                                    variables <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">"y1"</span>, <span class="st">"y2"</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>                                    lambda <span class="op">=</span> <span class="fl">1e-2</spa