用MATLAB实现二层bp神经网络的计算。可以改变阈值和权值以改进算法，并可以将该方法推广到多层网络。-Using MATLAB to achieve the second floor bp neural network computing. Can change the threshold value and weight to improve the algorithm and the method can be extended to the multi-layer network.

BP神经网络在matlab上已有可以使用的工具箱，本程序探讨如何实现简单的多层BP网络，并提供可执行的代码和例程供参考。(BP neural network has been available on the Matlab toolbox, this program discusses how to achieve a simple multi-layer BP network, and provide executable code and routines for reference.)

BP神经网络的MATLAB仿真 显示学习逼近和学习曲线(BP Artificial Neural Network)