On 29 July 2015 at 17:28, Rguy wrote: | The reason I am interested in using call by reference is that I am accessing | data frames with over a million rows and hundreds of columns. It is more | efficient to operate on such a data frame directly, as opposed to copying it | into and out of a function. In other words, I want to be *not* like R, which is | why I am interested in utilizing C++, which supports call by reference.
You misunderstand. We communicate by SEXP. Where the P stands for pointer. IE even with R> M <- as.data.frame(matrix(rnorm(1e6, 1e3))) R> object.size(M) 8000672 bytes R> we'd still only pass the same 56 bytes a SEXP takes. See eg https://cran.r-project.org/doc/manuals/R-ints.html#SEXPs and play with memory profiling in R. Dirk -- http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org _______________________________________________ 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
