Can you provide stan with data to be included in each step of the chain?

Modeling
1

Is there some way to inform the chain at each step by adding data together? For each chain, I want to add a vector of data to another vector of data.
For example, I would do a for loop when using MH.

data {
int nsteps;
vector[10] y;
  matrix [10, nsteps] x; 
} 

model{
for(i in 1:nsteps){
y = y + x[,i];
}
2

You may run the same instance of Stan program consequentially by updating the data and the priors from previous runs. I am not sure about purpose of this exercise, though

3

I’m not sure whst you mesn with step.
If you mean iteration, then no, Stan does not have information about the current iteration number accessible.

4

Thank you, yes I meant each iteration. It would be a vector of random variables, so the actual iteration number would not be important just that it is added during each iteration.

5

If you have a vector of random variables and you want to use the entire vector each iteration, then you can simply define the vector as data.

If you want to use only a random subset from the vector in each iteration, this is not supported by Stan.

6

got it, thanks for clarifying.