说明：  一个用delphi写的基于bp网络逼近函数的方法的源程序，程序提供的逼近函数包括：sin(x)*exp(-x)、sin(x)/x\1/(1+exp(-x))、(1-exp(-x))/(1+exp(-x))、阶跃、高斯。~..~
(with a written bp- based networks function approximation of the original source code. procedures for the approximation functions include : sin (x)* exp (-x), sin (x)/x \ 1/(1 exp (-x)), (1- exp (-x))/(1 exp (-x)), Step, Gaussian. ~ ~ ..)