sigmoid {e1071} | R Documentation |
Sigmoid 1/(1 + exp(-x)), first and second derivative.
sigmoid(x) dsigmoid(x) d2sigmoid(x)
Friedrich Leisch
plot(sigmoid, -5, 5, ylim=c(-.2, 1)) plot(dsigmoid, -5, 5, add=T, col=2) plot(d2sigmoid, -5, 5, add=T, col=3)