说明：  这是一个线性神经网络的matlab代码，包括线性神经网络的创建、误差曲面的绘制、曲线的拟合、误差函数的构建等内容，对初学者帮助大
(This is a linear neural network matlab code, including the creation of linear neural network, error surface rendering, curve fitting, etc. Construction of the error function, big help for beginners)