_ is defined in the Rcpp namespace, so perhaps you want to add :
using namespace Rcpp ;
somewhere on top.
Also, you could use mat.row(1) instead of mat(1,_)
Romain
Le 19/02/13 16:49, Bharath Govindarajan a écrit :
Hi ,
I am trying a simple example to assign entire rows to a
Rcpp::NumericMatrix. I read the Rcpp sugar document and looked at a few
online
examples. My simple code below produces errors:
#include <iostream>
#include <Rcpp.h>
using std::cout;
using std:endl;
// [[Rcpp::export]
void test()
{
Rcpp::NumericMatrux mat(100,100);
int rows = mat.nrow();
int cols = mat.ncol();
cout << "rows " << rows << endl;
cout << "cols " << cols << endl;
Rcpp::NumericVector row2 = mat(1,_);
cout << "mat(1,_) " << row2 << endl;
}
Error: error: '_' was not declared in this scope
Thank you
Bharath
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