Hello, everybody.

I have multinomial observations for N individuals over T times and have to iterate through it (T).

For a specific reason, I don’t have all N observations for every t in T.

As I’m modeling a categorical logistic regression, my response data has to be an integer and my idea was to create an array like

```
int Y[N, 1, T]; // Answers
```

and iterate

```
for(t in 1:T){
target += categorical_logit_glm_lpmf(Y[,1,t] | ...);
}
```

but I can’t do it because of the different dimensions of t’s.

Reading the discussion in How to pass an array of integer arrays of different lengths into Stan?, I understood that the best way to solve the problem was padding `Inf`

or `-Inf`

values on “incomplete” arrays, but it raised me two doubts:

1-) How can I write `-Inf`

as a number in my data?

2-) As I’m padding in the response vector, won’t Stan understands that the `-Inf`

number is a new response category?

Thanks!