FYI, there is a Array template in Rcpp11.
https://github.com/romainfrancois/Rcpp11/blob/master/inst/include/Rcpp/Array.h
With which you could use code like this:
#include <Rcpp.h>
using namespace Rcpp ;
// [[Rcpp::export]]
double NewFunc( NumericArray<3> x){
return x(1,2,3) + x(2,3,4) ;
}
Romain
Le 12 févr. 2014 à 15:23, Nick Menzies <[email protected]> a écrit :
> Hi Dirk, thanks for pointing me in the right direction.
>
> My solution below for a 3D array (documenting for rubes like myself). N
>
> library(Rcpp)
> library(RcppArmadillo)
>
> cppFunction('
> double NewFunc( NumericVector ArrayR ) {
> IntegerVector DimsA = ArrayR.attr("dim");
> arma::cube ArrayC(ArrayR.begin(),DimsA[0],DimsA[1],DimsA[2],false);
> double Output = ArrayC(1,2,3) + ArrayC(2,3,4);
> return Output;
> }', depends="RcppArmadillo")
>
> NewFunc(array(1,dim=c(5,5,5))) # Test, works
>
>
>
> On Tue, Feb 11, 2014 at 3:34 PM, Dirk Eddelbuettel <[email protected]> wrote:
>
> (Resending, this time with CC to list. Sorry for the extra first post. --Dirk)
>
> On 11 February 2014 at 11:49, Nick Menzies wrote:
> | Is there a way to pass an array into c++ when using cppFunction? I realize
> | arrays have been discussed a number of times, but the solutions I have found
> | (e.g. http://markovjumps.blogspot.com/2011/12/
> | r-array-to-rcpparmadillo-cube.html, or https://www.mail-archive.com/
> | [email protected]/msg05897.html) are described in the
> | context of cxxfunction, and I haven't been able to work how to implement
> this
> | with cppFunction.
>
> An array is just a vector with a dimension attribute. Treat it the same at
> the C++ level.
>
> There are several posts at the Rcpp Gallery dealing with reading / setting
> attributes, and you should know how to pass a single vector through.
>
> Dirk
>
> --
> Dirk Eddelbuettel | [email protected] | http://dirk.eddelbuettel.com
>
>
>
> --
>
> Nick Menzies
> [email protected]
> 404 217 1076
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