The Logistic Function and Derivatives

Description

Sigmoid 1/(1 + exp(-x)), first and second derivative.

Usage

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Arguments

x

a numeric vector

Author(s)

Friedrich Leisch

Examples

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plot(sigmoid, -5, 5, ylim = c(-.2, 1))
plot(dsigmoid, -5, 5, add = TRUE, col = 2)
plot(d2sigmoid, -5, 5, add = TRUE, col = 3)

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