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
registed " rcppm...@163.com" in NetEase mailbox, then i use it to join the
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 .
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
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