How to solve 3 differntial equation by Runge-Kutta 4th order

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How to Solve 3 Differential Equations Simultaneously by Runge-Kutta 4th order.
(When the 3 differential equations are in nonlinear form.)

Accepted Answer

John D'Errico
John D'Errico on 22 Nov 2021
If you NEED to use Runge-Kutta, then this is a homework assignment, and you are not telling us, because you know that we don't do your homework assignments here.
If it IS your homework assignment, then surely you can find pseudo-code to implement Runge-Kutta online? Start here:
If not homework, then you really don't need to use specifically Runge-Kutta, do you? And certainly, you don't need to write the code yourself. So start by reading the help docs for ODE45, looking carefully at the examples. Depending on the extent of the nonlinearity, that may suffice. If not, then you will need to spend some time actively researching methods to solve nonlinear ODE systems. But I'd bet this really is about your homework.
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Surayut Puttipatkl
Surayut Puttipatkl on 22 Nov 2021
Thank you for your reply, this isn't my homework, but maybe my brother's. I saw this problem on computer and I just practiced using MATLAB and I couldn't solve it. Next I will try to do it myself. Thank you.

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