Can anyone help me with a code for Runge-Kutta 4th Order for 3 coupled equations?

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Vineet Patel
Vineet Patel on 3 Nov 2018
Answered: Prakhar Jain on 12 Nov 2018
Hi All,
I need help with writing a code for Runge-Kutta 4th order equations.
The 3 equations are:
y_1' = -y_2 - y_3
y_2' = y_1 + (k_1 + y_2)
y_3' = k_2 + y_3(y_1 - k_3)
with initials of:
k_1 = k_2 = 0.2
k_3 = 5.7
Any help would be extremely appreciated.
Thank you
  1 Comment
John D'Errico
John D'Errico on 4 Nov 2018
Why not try it? Read the help and examples for ODE45. Or, are you asking someone to write a Runge-Kutta code for you?
If you insist, then why not look on the file exchange? Surely you can find some code there.

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Answers (1)

Prakhar Jain
Prakhar Jain on 12 Nov 2018
Hi Vineet,
You can start learning from here and how to code for Runge-kutta 4th order.
You can also compare your answer with the ODE45 in MATLAB.
Also, refer this file exchange link for further assistance.
Thanks.

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