ODE45/ODE15 inquiry about nonlinear spring

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haohaoxuexi1
haohaoxuexi1 am 25 Nov. 2021
Bearbeitet: haohaoxuexi1 am 30 Nov. 2021
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,

Akzeptierte Antwort

Star Strider
Star Strider am 25 Nov. 2021
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 am 25 Nov. 2021
Can you provide me with an example with second order derivative?
Thanks,
Star Strider
Star Strider am 26 Nov. 2021
Use the odeToVectorField function. The documentation should provide all the necessary examples.

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KSSV
KSSV am 25 Nov. 2021
  1 Kommentar
haohaoxuexi1
haohaoxuexi1 am 25 Nov. 2021
Bearbeitet: haohaoxuexi1 am 25 Nov. 2021
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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