Could you provide a demo for the R-program

[momo1986]

Thanks a lot for your pre-process r-file and markov-algorithm file.
Could you perhaps provide some demo case?
For example, I have no idea for this API:
top_k <- function(data, users, V_user_prod, V_prod_user, V_prev_next, V_next_prev,
top_k = 10, excluded_prods = NULL, parallel = FALSE)
what does the users mean?
If data is the training matrix, what is the meaning of "user"?
Thanks for your help!
Regards!
Neo