说明：  Matlab 的基础功能说明，对入门有帮助。推荐看看基本原理，矩阵运算，数组运算，矩阵函数，信号处理和多项式，绘图，控制流
(The basic function of Matlab instructions for beginners help. Recommend a look at the basic principles of matrix operations, array operations, matrix functions, signal processing and polynomials, graphics, control flow)