ODE45/ODE15 inquiry about nonlinear spring

2021 11 25
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更新时间：2021 11 30
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Is there anyone can help me on how to get an ODE45/ODE15 program to solve the above equation?
I want to get the value of y1 and y2.
Thanks,

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Star Strider
Star Strider 2021-11-25

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Since the system appears to describe a differential-algebraic equation, see the documentation section on Solve Differential Algebraic Equations (DAEs) that describes how to set it up symbolically in order to use ode15i to integrate it numerically.
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haohaoxuexi1
haohaoxuexi1 2021-11-25
Can you provide me with an example with second order derivative?
Thanks,
Star Strider
Star Strider 2021-11-26
Use the odeToVectorField function. The documentation should provide all the necessary examples.

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KSSV
KSSV 2021-11-25

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haohaoxuexi1
haohaoxuexi1 2021-11-25
编辑：haohaoxuexi1 2021-11-25
Would you mind to take a look at my equation?
I don't have the second order derivative term in equation#1.
And if possible, please tell me how to code it in ODE45/ODE15 to achieve my purpose?
In your example, you have theta and X, both of them have second order derivative term.
Thanks.

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