Coupled ODEs implementation

[thibmonsel]

Hi Patrick,

I want to implement a coupled ODE of the sort :

dx/dt = f(x) + y  
dy/dt = g(y)

I was wondering if it were the same without bigging deeper in the code of Multiterm and ODETerm :

• to create a latent variable z = [x y] and create a big network F = [f+y g] and then pass ODETerm(F) to diffeqsolve or I would need to use MultiTerm to combine both latent ODETerms [f(x) y] and [0 g(y)].

Thanks again for the library :)

[patrick-kidger]

Hey there. Creating a single F is the correct/simplest way to go.

(MultiTerm is used to express e.g. both the drift and diffusion in an SDE; you never need it when working with ODEs. You could use it here if you really wanted to... but it'd make life more difficult for no reason!)

[thibmonsel]

Thanks for clearing that up !