Stan equivalent to R's which()

[saudiwin]

Here check out this thread I started way back:

Stan equivalent of R's %in% function

Hi all - I had a need to create a version of R’s %in% function for Stan, so I decided to post the code here in case anyone finds it useful. Essentially checks if an integer matches a list of integers, and is useful for determining if an element index is in a pre-specified list of indices. It is only vectorized one way (the list of possible index matches), instead of 2-way as R’s is. test_R_in.stan (790 Bytes) R_in.R (326 Bytes) Here’s the Stan code, and demonstration R code is in the attache…