Example on how to use a NumericVector and manipulate it with the STL.
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NumericVector orig ; // from R NumericVector vec(orig.size()); // create a target vector of the same size // we could query size via // int n = vec.size(); // and loop over the vector, but using the STL is so much nicer // so we use a STL transform() algorithm on each element std::transform(orig.begin(), orig.end(), vec.begin(), sqrt_double ); return List::create(Named("result") = vec, Named("original") = orig);
As shown in the example section, provided the seed is reset, the exact same draws can be obtained in R itself – which is important for reproducibility.
Dirk Eddelbuettel and Romain Francois
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