How to Breakdown System of coupled ODEs into first order equations in order to solve with Runge-Kutta 4th order
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Hello all,
I am trying to solve the set of coupled ODEs I found in a journal using RK-45 method in matlab.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/240993/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/240994/image.png)
Boundary Conditions
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/240995/image.png)
I am having issues breaking the 2 equations down to a system of 5 first order equations because of the presence of a third order differential of F in both equations.
Any help will be greatly appreciated.
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