d="cb10-3"><a href="overview-of-data-types.html#cb10-3" aria-hidden="true" tabindex="-1"></a><span class="dt">vector</span>&lt;<span class="kw">lower</span>=-<span class="dv">1</span>, <span class="kw">upper</span>=<span class="dv">1</span>&gt;[<span class="dv">3</span>] rho;</span></code></pre></div>
<p>There are also special data types for structured vectors and
matrices. There are four constrained vector data types, <code>simplex</code>
for unit simplexes, <code>unit_vector</code> for unit-length vectors