S函数 Sigmoid Function or Logistic Function
octave代码
x = -10:0.1:10; y = zeros(length(x), 1); for i = 1:length(x) y(i) = 1 / (1 + exp(-x(i))); end figure; plot(x, y, '-b', 'LineWidth', 2);
S函数 Sigmoid Function or Logistic Function,布布扣,bubuko.com
S函数 Sigmoid Function or Logistic Function
原文：http://blog.csdn.net/watkinsong/article/details/37561087