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 " rcppm...@163.com" 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" <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
|
|
|
--
http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
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