Message-ID: <20790.39101.956873.830611@max.nulle.part>
Date: 2013-03-06T01:15:41Z
From: Dirk Eddelbuettel
Subject: [Rcpp-devel] Working with arma::cube
In-Reply-To: <01EAFA83F326C74A9FDA63CECD54CAC437BD7957@SN2PRD0710MB394.namprd07.prod.outlook.com>
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
--
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com