powered by
Sigmoid \(1/(1 + \exp(-x))\), first and second derivative.
sigmoid(x) dsigmoid(x) d2sigmoid(x)
a numeric vector
Friedrich Leisch
plot(sigmoid, -5, 5, ylim = c(-.2, 1)) plot(dsigmoid, -5, 5, add = TRUE, col = 2) plot(d2sigmoid, -5, 5, add = TRUE, col = 3)
Run the code above in your browser using DataLab