BP神经网络：应用BP神经网络逼近非线性函数，采用单层网络结构。提供仿真实例与源代码M文件，对于新手学习神经网络算法有很大的帮助！-BP neural networks: BP neural network to approach nonlinear function, single-layer network architecture. The simulation provided with the source code file M, neural network algorithm f