1. This returns a matrix rather than a vector: -- start of file teste.cpp --- #include <RcppArmadillo.h> // [[Rcpp::depends(RcppArmadillo)]]
using namespace arma; using namespace Rcpp; // [[Rcpp::export]] NumericVector teste(const vec& x) { vec v = x.subvec(1, 2); // x return wrap(v); // x } /*** R teste(1:4) */ --- end of file teste.cpp --- Now run in R: > sourceCpp("teste.cpp", rebuild = TRUE) > teste(1:4) [,1] [1,] 2 [2,] 3 2. If we replace the lines marked // x with return wrap(x.subvec(1, 2)); then it fails with a compiler error. error: cannot convert 'const arma::subview_col<double>' to 'SEXP' in initialization -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com _______________________________________________ Rcpp-devel mailing list Rcpp-devel@lists.r-forge.r-project.org https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel