Vectors/arrays, interpolation, other things

[mcol]

The lack of a variadic version of vector concatenation has come up very recently, although the interest there was for use in the generated quantities.

Append multiple vectors with append_row in generated quantities

I have what I assume to be a simple question about the Stan language and the use of append_row in generated quantities. Basically, I have three separate vectors, dubbed X and Y and Z. I need to combine them into a single, longer vector. Similar to rbind, the append_row[] function works great for this when there are only two objects. However, an error message occurs when trying to append three (or more) vectors simultaneously, as in: generated quantities { vector[N] FINAL; FINAL = append_row[X,…