ation <code><a href="problem.html">problem()</a></code> using the <span class="pkg">lpSolveAPI</span>
package. This function can also be used to customize the behavior of the
solver. It requires the <span class="pkg">lpSolveAPI</span> package.</p>
    </div>

    <div id="ref-usage">
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">add_lpsolveapi_solver</span><span class="op">(</span><span class="va">x</span>, gap <span class="op">=</span> <span class="fl">0</span>, presolv