 <code class="docutils literal notranslate"><span class="pre">Hnn</span></code>, <code class="docutils literal notranslate"><span class="pre">Hnx</span></code>) estimated from the data
sequence (<code class="docutils literal notranslate"><span class="pre">Sig</span></code>)  using a base-2 logarithm.</p>
<p>[Attn, Hxx, Hnn, Hxn, Hnx] = AttnEn(Sig, ‘Logx’, value)</p>
<p>Returns the attention entropy (<code class="docutils literal notranslate"><span class="pre">Attn</span></code>) and the sub-entropies 
(