[Rcpp-devel] Significant difference in performance when computing Ax

[Dirk Eddelbuettel]

On 27 April 2014 at 14:34, Avraham Adler wrote:
| I feel foolish now. I forgot to note that I build R using a Win64
| version of OpenBLAS (see
| <http://www.avrahamadler.com/2014/04/20/r-3-1-0-openblas-speed-comparisons/>
| for more). I'm certain that the speed in tcrossprod is coming from an
| optimized compile of R and BLAS. My apologies for any confusion.

That is a _feature_ and not a bug.  See eg this r-devel tread from 2005:

   http://thread.gmane.org/gmane.comp.lang.r.devel/2370/

Oh the good old days when Doug Bates still posted on r-devel ...

Dirk

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