 to initialize from a very small interval around zero, which is an
option built into all of the Stan interfaces.</p>
</div>
</div>
<div id="absolute-jacobian-determinant-of-the-unit-vector-inverse-transform" class="section level3 unnumbered">
<h3>Absolute Jacobian determinant of the unit vector inverse transform</h3>
<p>The Jacobian matrix relating the input vector <span class="math inline">\(y\)</span> to the output vector
<span class="math inline">\(x\)</span> is singular because <span class="math inline"