Envoyé de mon iPhone
> Le 3 déc. 2014 à 17:59, Gabor Grothendieck <ggrothendi...@gmail.com> a écrit :
>
> 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
This should be easy/trivial to fix for someone with the right skills.
Romain
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
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