中文说明：三种类型的神经网络代码前馈多层感知器径向基函数为下面的函数x =-20: 0.01: 20;y = (0.05 * x.^3)-(0.2 * x.^2)-3 * x + 20;
English Description：
Three types of neural network code Feed Forward MLP RBF For the following function x = -20: 0.01: 20; y = (0.05 * x. ^ 3) - (0.2 * x. ^ 2) -3 * x + 20;