Question: rfk45_dae scheme

Hi,

The system below is successfully solved by using rfk45_dae method

 

I want to write the Runge Kutta scheme according to rfk45 method so as to have

S'=F(x,U,S,..), U'=G(x,U,S,..), ...

The presence of diff(S,x,x) in the second equation doesn't help me to definie F and G functions.

Thanks for your help 

 

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