ecks" class="section level3" number="3.5.1">
<h3><span class="header-section-number">3.5.1</span> Optimizing by ignoring range checks</h3>
<p>When assigning or reading from with vectors, row_vectors, matrices or arrays using indexing, Stan performs cheks that
a supplied index is valid (not out of range). These check avoids segmentation faults and other runtime errors
that can be difficult to debug.</p>
<p>For some models these checks can represent a significant part of the models execution time. By setting 