On 5 August 2014 at 16:25, Sven E. Templer wrote: | ii), e.g.: | | http://www.mail-archive.com/search?q=call+R+function&l=rcpp-devel%40lists.r-forge.r-project.org | | or try yourself: | | http://www.mail-archive.com/rcpp-devel@lists.r-forge.r-project.org/
Or stackoverfloww: http://stackoverflow.com/search?q=%5Brcpp%5D+call+R+function (which gets a few false positive) | Nevertheless I liked the question and learned something today (thank Then you never read the Rcpp-introduction vignette, or our corresponding JSS article, either. Maybe you should? ;-) In its there too... We're happy to help everybody here in as much as we can as it better for all if the Rcpp community grow, and I generally try to reply reply promptly --- but it is simply not efficient use of everybody's (limited) time to repeat the same information over and over. Dirk | you Romain). So the trend is at least away from, and not towards iii). | And for iv), nice alias, though... it may also be political. | | On 5 August 2014 14:50, Dirk Eddelbuettel <e...@debian.org> wrote: | > | > On 5 August 2014 at 17:30, super wrote: | > | | > | Yes , maybe that is very close to my needs , sorry for my pool english | > | expression. But, the following code can't work: | > | double meanC(NumericVector x) { | > | Function mean=Environment("package::base")["mean"]; | > | return mean(x); | > | } | > | with the error "can't convert SEXP to double" | > | How can i fix it ? Tks. | > | > With all due respect: | > | > i) you have not motivated why you need mean from R | > | > ii) how to call an R function from Rcpp as been discussed on this list | > probably half a dozen times by now, so please consider learning how to | > search the list archive via Google | > | > iii) you are showing a somewhat larger amount of unfamiliarity with Rcpp | > | > iv) you are hiding behind an anon mail handle in violation of the common | > R mailing list standards we follow here too | > | > so I am not going out of my way to repeat all of which you can already find | > via ii) another time for you. | > | > Dirk | > | > | > | At 2014-08-05 04:30:32, "Romain Francois" <rom...@r-enthusiasts.com> wrote: | > | | > | Not sure what you mean by hide the R function. You can extract a function | > | by its name on the C++ side : | > | | > | Function bazinga("mean") ; | > | | > | or extract it from a particular environment, e.g. | > | | > | Environment("package:base")["mean"] | > | | > | or | > | | > | Environment base("package:base") ; | > | Function foo = base["mean"] | > | | > | Romain | > | | > | Le 5 août 2014 à 09:26, super <rcppm...@163.com> a écrit : | > | | > | | > | Hello Rcppusers, | > | I want to call a r function in Cpp code, e.g. | > | int meanC( NumericVector x) { | > | return mean(x,_["na.rm"]=TRUE); | > | } | > | Here function mean is a r function not rewrittened Rcpp version's | > | mean. I do know one way to do this: | > | int meanC( Function f,NumericVector x) { | > | return f(x,_["na.rm"]=TRUE); | > | } | > | Then meanC(mean,1:3) | > | but can i hidden the true r function called ? Is r functions packed | > | into some namespace? | > | | > | | > | | > | | > | _______________________________________________ | > | 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 | > | | > | | > | | > | | > | | > | _______________________________________________ | > | 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 | > | > -- | > 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 | _______________________________________________ | 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 -- 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
