[R] Ubuntu vs Mac OS X

[Dirk Eddelbuettel]

On 26 April 2008 at 12:27, Prof Brian Ripley wrote:
| 3) If you are doing matrix algebra you want an optimized BLAS.  The CRAN 
| build of R for Mac OS by default uses vecLib (which is optimized by 
| Apple).  On other OSes R can be built to use optimized BLAS (see the 
| manual) -- my understanding is that on Debian derivatives it is built to 
| make use of the system libblas, and you can install versions of the latter 
| based on ATLAS. Some optimized BLAS can make use of multiple CPUs.

Yes, on Ubuntu, use 'apt-get install atlas3-base' for basic tuned Atlas, or
'apt-get install atlas3-sse2' assuming that sse2 is the closest fit to the
cpu in question.
 
Dirk

-- 
Three out of two people have difficulties with fractions.