Can you or are there any plans for introducing real to integer conversion?
In my use case I’ve an array of pre-computed matrices:
matrix[20, 20] A_inv. I would like to be able to choose a matrix like
idx is calculated from real variables, eq
idx = to_integer(ceil(x/5.0)).
The reference manual 2.17 chapter 41.7 states: “The rounding functions cannot be used as indices to arrays because they return real values. Stan may introduce integer-valued versions of these in the future, but as of now, there is no good workaround.”