本源码为原创代码。包含分别用改进欧拉方法、龙格-库塔法、阿当母斯法求解形如y =f(x,y)的常微分方程的源代码。希望对用到数值计算算法的起帮助作用。-The source for the original code. Included were the improved Euler method, Runge- Kutta method, Adam mother there method of the form y ' = f (x, y) of ordinary differentia