peocess

代码说明：

  龙格---库塔方法是求解微分方程比较常用的方法,在理解数学上是怎么一回事后,编制这个程是相当容易的,就是个迭代的过程 步长的(The Runge-Kutta method is a common method for solving differential equations. After understanding what is going on in mathematics, it is quite easy to compile this process, which is an iterative process step.)