Rcpp sugar for rank function

问题

I have been trying to get the rank of a vector in c++ using Rcpp. I have used other sugar functions like

is_na();

Is there a similar sugar function for rank R function in c++. Also is there any list of available R sugar functions in Rcpp/

回答1:

1) There is an order function here and order(order(x)) is rank(x, ties = "first").

2) A second way would be: match(x, sort(x))

ADDED Second approach.

来源：https://stackoverflow.com/questions/23606266/rcpp-sugar-for-rank-function