说明：  Matlab 下 BP 神经网络的举例及详细说明。美国大学的一个实验。 虽然是 PDF文件，但程序可以直接粘贴下来运行。
(The process to train and test a designed MLP neural network : 1) We make training patterns and test patterns. 2) A network architecture should be defined by newff MATLAB function with the number of layers, neurons and transfer functions. 3) The defined neural network architecture is trained by train MATLAB function with input patterns and training parameters. 4) We can easily check the result by using a sim MATLAB function. )