%Differential Equation
%%
% dslove 可求得解析解
% https://ww2.mathworks.cn/help/symbolic/dsolve.html?searchHighlight=dsolve&s_tid=doc_srchtitle
%%
%ODE 数值解
% https://ww2.mathworks.cn/help/matlab/math/choose-an-ode-solver.html#bu22m6i-1
% https://ww2.mathworks.cn/help/matlab/ref/ode45.html
原文：https://www.cnblogs.com/lancezliang/p/10423995.html