用ode45求解方程组，通过不断近似迭代-Ode45 for solving equations

the attachment file is a matlab file about ODE. this include the rutine ODE45 of matlab.

振动理论中运用单自由度系统的实际例子来列出微分方程并使用ode45进行计算解答-Vibration theory using practical examples to list a single degree of freedom system differential equations and calculations using ode45 answer

syms y(t) r 2 V odeToVectorField(diff(y, 2) + 0.5*diff(y, 1) - y^3+y^5 r*cos(t)) M matlabFunction(V, vars , { t , Y }) -syms y(t) r 2 V odeToVectorField(diff(y, 2)+ 0.5*diff(y, 1)- y^3+y^5 r*cos(t)) M matlabFunction(V, vars