说明：  本课件主要讲述MMatlab Simulink中S函数(Function)的写法,其中包含非常实用的S-函数介绍（为什么要引入S-Function？)、S-函数的分类、使用（实例演习）等
(The courseware in the main about MMatlab Simulink S function (Function) is written, which contains the S-function is very useful Introduction (why the introduction of S-Function?), S-function category, the use of (example exercises), etc.)