pan id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a>mu = a + b * x;</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>This program is well formed, but is almost certainly a coding error, because it attempts to use <code>mu</code> before it is set. The direct translation to C++ code highlights the potential error of using <code>mu</code> in the first statement:</p>
<div class="sourceCode" id="cb4"><pre class="sourceCode stan co