Thanks for your guide!
-- PO SU [email protected] Majored in Statistic Shanghai JiaoTong University At 2014-08-05 11:23:03, "Dirk Eddelbuettel" <[email protected]> wrote: > >On 5 August 2014 at 23:07, super wrote: >| I am sorry for that, i understand you. >| I think i should read your book seamless R and C++ ... first. I shoudn't >just >| want to get a quick guide which maybe convinient to me but the oppsite to >you . >| BTW, i am a student from SJTU in china,and Google can't be used in china >now. I > >I used "Google" as shorthand for "use a search engine". There must be some >that are not flagged by your authorities. > >You can also search at some of the 'mailing list as website' archives like >gmane.org, mail-archive.com, markmail.org, ... At least the first two carry >(or carried) this list. > >| registed " [email protected]" in NetEase mailbox, then i use it to join the > >Consider adding a .signature with your name and affiliation as is often >recommended on r-help and other R lists. I show my name, so it seems fair to >me to >ask the same from you. > >| maillist. I used r-help maillist just several days ago. There must be a lot >of >| things i don't know to use maillist like filter rule and the problem you >said. >| but i will figure them out . > >Sounds good. Always glad to help, but also trying not to answer the same >questions over and over -- I'd rather try answering new ones. > >Have a look at the vignettes: Rcpp-introduction, Rcpp-FAQ, Rcpp-attributes as >well as the other ones depending on what you are interested in. > >Dirk > > > > >| At 2014-08-05 08:50:02, "Dirk Eddelbuettel" <[email protected]> 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" <[email protected]> >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 <[email protected]> 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 >| >| [email protected] >| >| >https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel >| >| >| >| >| >| >| >| >| >| >| >| _______________________________________________ >| >| Rcpp-devel mailing list >| >| [email protected] >| >| https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel >| > >| >-- >| >http://dirk.eddelbuettel.com | @eddelbuettel | [email protected] >| >| >| > >-- >http://dirk.eddelbuettel.com | @eddelbuettel | [email protected]
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