[Rcpp-devel] Working with arma::cube

Dirk Eddelbuettel edd at debian.org
Wed Mar 6 02:15:41 CET 2013

On 6 March 2013 at 00:50, Silkworth,David J. wrote:
| I am helping a student build some R code in Rcpp for his first time.  He is
| working with 3-dimensional arrays, so I am hopeful to be working with
| arma::cube objects.
| When I simply try to bring the array in as an argument I can?t seem to use the
| same as<[TEMPLATE]> construction as other objects.
| arma::cube X=Rcpp::as<arma::cube>(arg1);
| This line fails to compile.

Yes. Nobody wrote such a converter. Maybe you and your student want to take a stab?
| I can build this cube from an input vector using explicit nested loops.  I also
| notice that wrap() does a fine job of returning the array back to R.
| Is there anything else I need to know to more simply bring the array in as an
| SEXP and land it in the arma::cube.

Array plus dim attribute may work.  

I used arma::cube quite extensively in one project, but only at the C++ level
as a container. Results back to R were always of lesser dimension.


Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com  

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