Boiler plate
As you saw in the previous exercise, the code below does not compile.
#include <Rcpp.h>
using namespace Rcpp ;
double twice(double x){
return x + x
}
Let's modify it.
This exercise is part of the course
Optimizing R Code with Rcpp
Exercise instructions
- Fix the syntax error on the function's return line (line 8).
- Add an
[[Rcpp::export]]decorator so that the function is exported to R.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
#include
using namespace Rcpp ;
// Export the function to R
double twice(double x) {
// Fix the syntax error
return x + x
}