s is an old version, <a href="https://mc-stan.org/docs/stan-users-guide/matrices-arrays.html#fixed-sizes-and-indexing-out-of-bounds">view current version</a>.
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<div id="fixed-sizes-and-indexing-out-of-bounds" class="section level2">
<h2 number="16.2"><span class="header-section-number">16.2</span> Fixed Sizes and Indexing out of Bounds</h2>
<p>Stan’s matrices, vectors, and array variables are sized when they are
declared and may not be dynamically resized. Function arguments do
not have sizes, but t