KnowledgeHub
Questions
Tags
Users
Search
Alex Rivera
|
Logout
Edit Question
Title
Body
I'm looking into using some C++ for simple parts of my R package using the Rcpp package. I'm a C++ novice (but keen to learn!). I've implemented a few simple cpp programs using the excellent Rcpp - in fact that package has motivated me to learn C++... Anyway, I've got stuck with a simple problem, which if I can fix would help lots. I have a NumericVector I want to subset and then sort. The code below sorts the whole vector (and would also deal with NAs, which is what I need). My question is, say I want to extract a part of this vector, sort and have it available for other processing - how can I do that? For example, for a vector of length 10, how do I extract and sort the elements 5:10? #include <Rcpp.h> using namespace Rcpp; // [[Rcpp::export]] RcppExport SEXP rollP(SEXP x) { NumericVector A(x); // the data A = sort_unique(A); return A; } which I call from R: sourceCpp( "rollP.cpp") rollP(10:1) # [1] 1 2 3 4 5 6 7 8 9 10
Tags (comma-separated)
Save Edits
Cancel