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]
_______________________________________________
Rcpp-devel mailing list
[email protected]
https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
