, <code>+</code>, <code>=</code>, <code>[</code>, <code>]</code>, <code>|</code>, <code>&lt;</code>, <code>,</code>, <code>&gt;</code>, <code>/</code>.<br>
</li>
<li>For best practices, use only letters, numbers, and underscores (<code>_</code>) when naming variables.<br>
</li>
<li>Each variable can be initialized with either a single scalar (representing a theoretical starting point) or a full vector of real data.</li>
</ul>
<div class="sourceCode" id="cb4"><pre class="downlit sourceCode r">
<code class="s