 the details of the internal storage.  For
many <code>oce</code> sub-classes, <code>[[</code> can also return quantities that are computed
from the object's contents.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="co"># S4 method for class 'adp'</span></span>
<span><span class="va">x</span><span class="op">[[</span><span class="va">i</