[Rcpp-devel] compileAttributes() does not export function

[JJ Allaire]

You need two colons after Rcpp in the attribute, e.g. Rcpp::export

On Sat, Sep 27, 2014 at 6:30 AM, Kevin Kunzmann <kevinkunzmann at gmx.net> wrote:
> Hi,
>
> I am experiencing a problem with the 'export' attribute. The file
> 'cmest.cpp' is compiled all right, but Rcpp misses the function 'cv' both in
> RcppExports.cpp as well as RcppExports.R - the compileAttributes() function
> ignores the export statement. Other functions are exported correctly form
> the same project / source folder! Any Idea?
>
> Best,
>
> Kevin
>
> #include <RcppArmadillo.h>
>
> // [[Rcpp::depends(RcppArmadillo)]]
>
> // [[Rcpp:export]]
> Rcpp::List cv(arma::mat data, int n)
> {
>     // n must be small enough!
>
>     // find stage one indices
>     arma::Col<int> inds = arma::Col<int>(data.n_rows);
>     int nStageOne = 0;
>     for(int i = 0; i < data.n_rows; i++)
>     {
>         inds(nStageOne) =  i;
>         nStageOne       += 1;
>     }
>     inds.set_size(nStageOne);
>
>     // randomize indices
>     inds = arma::shuffle(inds);
>
>     // select first n items from each subgroup (marker x treatment)
>     arma::mat      res    = arma::zeros<arma::mat>(data.n_rows - 4*n,
> data.n_cols);
>     int            nRes   = 0;
>     arma::mat      oob    = arma::zeros<arma::mat>(n*4, data.n_cols);
>     arma::Col<int> nCount = arma::zeros<arma::Col<int> >(4);
>     for(int i = 0; i < nStageOne; i++)
>     {
>         if(data(inds(i), 1) == 0 && data(inds(i), 3) == 0 && nCount(0) < n)
>         {
>             // 00
>             for(int j = 0; j < data.n_cols; j++)
>             {
>                 oob(sum(nCount), j) = data(inds(i), j);
>             }
>             nCount(0) += 1;
>             continue;
>         }
>         if(data(inds(i), 1) == 0 && data(inds(i), 3) == 1 && nCount(1) < n)
>         {
>             // 01
>             for(int j = 0; j < data.n_cols; j++)
>             {
>                 oob(sum(nCount), j) = data(inds(i), j);
>             }
>             nCount(1) += 1;
>             continue;
>         }
>         if(data(inds(i), 1) == 1 && data(inds(i), 3) == 0 && nCount(2) < n)
>         {
>             // 00
>             for(int j = 0; j < data.n_cols; j++)
>             {
>                 oob(sum(nCount), j) = data(inds(i), j);
>             }
>             nCount(2) += 1;
>             continue;
>         }
>         if(data(inds(i), 1) == 1 && data(inds(i), 3) == 1 && nCount(3) < n)
>         {
>             // 00
>             for(int j = 0; j < data.n_cols; j++)
>             {
>                 oob(sum(nCount), j) = data(inds(i), j);
>             }
>             nCount(3) += 1;
>             continue;
>         }
>         // else
>         for(int j = 0; j < data.n_cols; j++)
>         {
>             res(nRes, j) = data(inds(i), j);
>         }
>         nRes += 1;
>     }
>     return Rcpp::List::create(Rcpp::Named("data") = res,
>                               Rcpp::Named("oob")  = oob);
> }
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