e1071: sigmoid – R documentation

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sigmoid

The Logistic Function and Derivatives

Description

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

Usage

sigmoid(x)
dsigmoid(x)
d2sigmoid(x)

Arguments

`x`	a numeric vector

Author(s)

Friedrich Leisch

Examples

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

e1071

Misc Functions of the Department of Statistics, Probability Theory Group (Formerly: E1071), TU Wien

v1.7-11

GPL-2 | GPL-3

Authors

David Meyer [aut, cre], Evgenia Dimitriadou [aut, cph], Kurt Hornik [aut], Andreas Weingessel [aut], Friedrich Leisch [aut], Chih-Chung Chang [ctb, cph] (libsvm C++-code), Chih-Chen Lin [ctb, cph] (libsvm C++-code)

Initial release