Syntax for an array of range-constrained vectors?

What’s the correct syntax for an array of vectors, with range constraints?

 // Works: A vector of length K
vector[K] alpha;                            
 // Works: A vector of length K, with range constraint
vector<lower=0>[K] alpha;       
// Does not work
vector<lower=0>[K] alpha[J]; 

array[J] vector<lower=0>[K] alpha;

At least since cmdstan 2.29, I think.

1 Like

What do you mean by “does not work”? Both syntaxes work fine as far as I can tell. At least the following Stan program compiles in Stan 2.29,

parameters {
  array[5] vector<lower=0>[10] x;
  vector<lower=0>[10] y[5];

Was there some kind of runtime error?