nd rescale a parameter constrained to
<span class="math inline">\((0, 1)\)</span>.</p>
<pre><code>data {
  int N;
  vector[N] L;  // lower bounds
  vector[N] U;  // upper bounds
  ...
parameters {
  vector&lt;lower=0, upper=1&gt;[N] alpha_raw;
  ...
transformed parameters {
  vector[N] alpha = L + (U - L) .* alpha_raw;</code></pre>
<p>The expression <code>U - L</code> is multiplied by <code>alpha_raw</code>
elementwise to produce a vector of variables in <span class="math inline">\((0, U-L)\)</span>, then
a