div class="block">Usual sigmoid function, where the lower asymptote is 0 and the higher
 asymptote is 1.</div>
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<td class="colOne"><code><strong><a href="../../../../../../org/apache/commons/math3/analysis/function/Sigmoid.html#Sigmoid(double, double)">Sigmoid</a></strong>(double&nbsp;lo,
       double&nbsp;hi)</code>
<div class="block">Sigmoid function.</div>
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