On 26 February 2014 at 16:23, Hideyoshi Maeda wrote: | Hi Rcpp devel list, | | One of the functions I like to use is zoo’s rollapply() function. However sometimes this can be slow as it is basically a long loop using mapply. | | Given how fast loops are in C++ this seems like this would be the perfect thing to covert into C++, BUT, one of the benefits of rollapply, is that it is flexible and you can put in any R custom function you like. I think there are some functionality in Rcpp that allow you to carry out custom R functions, but not sure what it is or if it would be helpful as you might have to recursively keep calling R each time it need the custom function in the loop. | | So I guess my question is 1) is there an existing implementation that has converted rollapply to C++ and 2) if not, then given the desired flexibility of using custom functions in rollapply, would converting it into C++ code be worthwhile? 3) if it would be worthwhile, then what should I be researching to be able to get custom functions into Rcpp/C++?
Have you looked at RcppRoll yet? See http://cran.r-project.org/web/packages/RcppRoll/index.html 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
