Hi all,
I have very little experience with Rcpp and also with c++, so I am
sorry if my question might be too stupid.
I am trying to use iterators in my code, because I understand them
better than vectors, because they should be efficient, and because I
should be able to combine different implementations of vector and
matrix classes. However the following code does not compile:
#include <Rcpp.h>
using namespace Rcpp;
typedef NumericVector::iterator DoubleIter;
double sum(DoubleIter b, DoubleIter e){
double sum = 0;
while (b!=e){
sum += *(b++);
}
return sum;
}
// [[Rcpp::export]]
double sumFirstRow(NumericMatrix mat){
return sum(mat(0,_).begin(), mat(0,_).end());
}
The error message is not very useful (or at least I cannot interpret it):
In function 'double sumFirstRow(Rcpp::NumericMatrix)':
error: no matching function for call to
'sum(Rcpp::MatrixRow<14>::iterator, Rcpp::MatrixRow<14>::iterator)'
note: candidates are:
note: double sum(DoubleIter, DoubleIter)
note: no known conversion for argument 1 from
'Rcpp::MatrixRow<14>::iterator' to 'DoubleIter {aka double*}'
Am I missing something very basic?
Thanks a lot!
Ale
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