t])^{T}
= 0
\]</span> for the stationary covariance <span class="math inline">\(\mathrm{V}\left[x_\infty\right]\)</span> by
calling a linear solver on the vectorized system of equations (using
kronecker products).</p>
</div>
<div class="section level3">
<h3 id="argument-control">Argument: <code>control</code><a class="anchor" aria-label="anchor" href="#argument-control"></a>
</h3>
<hr>
<p>This argument is a list which controls various settings of the
<code><a href="https://rdrr.io/r/stats/nlminb.html" class