[Rcpp-devel] Passing NumericVector as std::vector<double>?

[Dirk Eddelbuettel]

On 13 November 2011 at 09:52, Steve Lianoglou wrote:
| Hi,
| 
| Sorry if I've missed the obvious examples/documentation .. this seems
| like an easy enough scenario that must be documented somewhere, but
| I'm not seeing it.

IIRC several of the intro docs should hsve it, same with the lidt srchive.

| Imagine that the C++ code I am wrapping w/ Rcpp expects
| std::vector<XXX> objects in its API. Is there an easy way for me to
| convert an Rcpp NumericVector (or IntegerVector) to an std::vector so
| the compiler doesn't complain?
| 
| Currently, in my .Call interface function, I might have something like:
| 
| SEXP Rsomething(SEXP x_) {
|   std::vector<double> x = Rcpp::as< std::vector<double> >(x_);
|   std::vector<double> result = something(x); // something defined in C++ lib
|   return Rcpp::wrap(result);
| }
| 
| But, can I do something like:
| 
| SEXP Rsomething(SEXP x_) {
|   Rcpp::NumericVector x(x_);

a)  Just create a new stl vector from x here, or

b)  Use x.begin() in the call to something:  something(x.begin());


Hth, Dirk


|   std::vector<double> result = something(x.TO_STL()); // or something
|   return Rcpp::wrap(result);
| }
| 
| Thanks,
| -steve
| 
| -- 
| Steve Lianoglou
| Graduate Student: Computational Systems Biology
|  | Memorial Sloan-Kettering Cancer Center
|  | Weill Medical College of Cornell University
| Contact Info: http://cbio.mskcc.org/~lianos/contact
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