
<span><span class="co"># S3 method for class 'MDB'</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/base/length.html" class="external-link">length</a></span><span class="op">(</span><span class="va">x</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># S3 method for class 'MDB'</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/base/lengths.html" class="external-link">lengths</a></span><span class="op">(</span><span class="va">x</span>, use.names <span 