Message-ID: <19891.35328.302886.48323@max.nulle.part>
Date: 2011-04-24T02:25:04Z
From: Dirk Eddelbuettel
Subject: [Rcpp-devel] how to use functions from other packages
In-Reply-To: <19891.34180.356063.361036@max.nulle.part>
On 23 April 2011 at 21:05, Dirk Eddelbuettel wrote:
|
| On 23 April 2011 at 20:36, Siddhartha Chib wrote:
| | This is likely to be too simple a question perhaps. How does one use specific
| | functions from other packages when working with Rcpp? For that matter, is it
| | possible to use R functions such as optim in Rcpp?
|
| Yes, sure. I don't think we have a great example though.
[...]
| A concise example would be good. Maybe another list member has something?
PS This may be obvious too, but let's just state it plainly to be sure: in
iterative optimisation, if you repeatedly go back between R and C++ you
are likely to give up a bunch of the speed gain Rcpp can otherwise offer.
There are other tricks one can use to access the _C_ part of certain R
functions. Frequent list contributor Davor had done some nice work getting
at the inner (C language) part of loess(); that is now also in a CRAN
package 'rgam' which uses Rcpp and RcppArmdillo:
http://cran.r-project.org/web/packages/rgam/index.html
Hope this helps, Dirk
--
Gauss has an Erdos number of -1.
-- #63 at http://www.gaussfacts.com