EVOLUTION-MANAGER
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: The Logistic Function and Derivatives</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for sigmoid {e1071}"><tr><td>sigmoid {e1071}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>The Logistic Function and Derivatives</h2> <h3>Description</h3> <p>Sigmoid <i>1/(1 + exp(-x))</i>, first and second derivative.</p> <h3>Usage</h3> <pre> sigmoid(x) dsigmoid(x) d2sigmoid(x) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>x</code></td> <td> <p>a numeric vector</p> </td></tr> </table> <h3>Author(s)</h3> <p>Friedrich Leisch</p> <h3>Examples</h3> <pre> plot(sigmoid, -5, 5, ylim = c(-.2, 1)) plot(dsigmoid, -5, 5, add = TRUE, col = 2) plot(d2sigmoid, -5, 5, add = TRUE, col = 3) </pre> <hr /><div style="text-align: center;">[Package <em>e1071</em> version 1.7-3 <a href="00Index.html">Index</a>]</div> </body></html>