今天帮同学做了一个非线性函数的曲线拟合，以前没做过，所以是摸着石头过河。费了一下午时间，终于把曲线拟合出来了，顺道也学习了使用Matlab进行曲线拟合的方法，把学习所得记录下来，和大家共享。-Today, help students to do a nonlinear function curve fitting, never done before, it is feeling the stones. Spent an afternoon, and finally the curve fitting out, take the opportunity to also learn to use Matlab for curve fitting method, the study proceeds record and share.