[Rcpp-devel] Can I fill a matrix row by row with std<vector> (or similar)

stat quant statquant at outlook.com
Fri Mar 1 17:15:43 CET 2013

Hello list,
I have several std::vector<double> in a STL container and would like to
fill a Rcpp::NumericMatrix row by row with them, is there an easy way to do
it, or should I iterate over all elements as in usual C++?
I saw the `_` in this post on SO but I think it has a different purpose.
cCode <- '
    double v_value[] = {1.1,2.4};
    vector<double> v(v_value, v_value + sizeof(v_value)/sizeof(double));
    NumericMatrix m(3,2);

    //Here is what I was hoping for
    //for(int i=0; i<3; i++){
    // m(i,_) = v;

    return m;
fillMat <- cxxfunction(signature(), includes='using namespace std;',
plugin="Rcpp", body=cCode)

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