How to infer size of a rolling window using Stan?

[bbbales2]

@omarfsosa

I didn’t know I could use that ternary operator in the model block (it feel somewhat non-differentiable)

It’s possible with if statements and for loops to accidentally write non-differentiable stuff. It can be difficult to debug so you just gotta watch out :P (and void branching on things that are functions of parameters)