matlab提供了边值问题求解器bvp4c（）用于求解边值问题的数值解，bvp4c（）采用带自适应网格的高阶差分法来求解边值问题，首先给出可调用的常微分方程组函数以及残差的边值条件函数，这些函数都必须返回一个列向量。(Matlab provides the numerical solution of the boundary value problem solver bvp4c () for solving the boundary value problem. Bvp4c () uses the high order difference method with adaptive grid to solve the boundary value problem. First, we give the invocable ordinary differential equation set function and the residual boundary value condition function. These functions must return a column vector.)