On 7 February 2011 at 17:23, WEI ZHANG wrote: | I would like to know how can I pass NA from C++ to R.
Just assign it, using the constants defined in Rmath.h: R> suppressMessages(library(inline)) R> src <- 'Rcpp::NumericVector v(4); + v[0] = R_NegInf; // -Inf + v[1] = NA_REAL; // NA + v[2] = R_PosInf; // Inf + v[3] = 42; // see the Hitchhiker Guide + return Rcpp::wrap(v);' R> fun <- cxxfunction(signature(), src, plugin="Rcpp") R> fun() [1] -Inf NA Inf 42 R> | For example, for any integer in C++ , if == -999, I would like to set to NA to | pass to R. This works for _floats_ but not integers, so you have to convert to 'numeric' first, You can the convert -999.0 to NA_REAL if you like. As as seen above, R will see it as NA. Hope this helps, Dirk -- Dirk Eddelbuettel | e...@debian.org | http://dirk.eddelbuettel.com _______________________________________________ Rcpp-devel mailing list Rcpp-devel@lists.r-forge.r-project.org https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
