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 <e...@debian.org> 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/
> | rcpp-devel@lists.r-forge.r-project.org/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 | e...@debian.org | http://dirk.eddelbuettel.com
>
--
Nick Menzies
nick.menz...@gmail.com
404 217 1076
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