ATLAS BLAS

I have R 2.11.1 installed (soon will update to R 2.12) and I appear to have a Nehalem-based Mac Pro.

I'm trying to find documentation about how to set up R on my Mac so I'm using the ATLAS BLAS.

Well, you have to get it [=ATLAS] first. Then it's as easy as pointing the libRblas.dylib symlink to it.

I have a binary of ATLAS that you can use if you have Mac OS X 10.6 (Snow Leopard) it's at
http://r.research.att.com/libatlas-MacPro.dylib

So the copy/paste steps (you have to be admin) are:

cd /Library/Frameworks/R.framework/Resources/lib
curl -O http://r.research.att.com/libatlas-MacPro.dylib
chmod a+x libatlas-MacPro.dylib
ln -sfn libatlas-MacPro.dylib libRblas.dylib

## if you want to go back to vecLib
cd /Library/Frameworks/R.framework/Resources/lib
ln -sfn libRblas.vecLib.dylib libRblas.dylib

## if you want to use R's BLAS (not as fast but more reliable)
cd /Library/Frameworks/R.framework/Resources/lib
ln -sfn libRblas.0.dylib libRblas.dylib
I installed this version of R using the Mac installer R-2.11.1.pkg.
Does this installer set up R that uses the ATLAS BLAS, or are there
additional steps I need to take to have R use the ATLAS BLAS?

Once R is up and running, can anyone tell me how I can determine
which BLAS R is using?

Indirectly, just look at the output of
ls -l /Library/Frameworks/R.framework/Resources/lib/libRblas.dylib

Cheers,
Simon
Any info appreciated. 

sessionInfo()
R version 2.11.1 (2010-05-31) 
x86_64-apple-darwin9.8.0 

locale:
[1] en_CA.UTF-8/en_CA.UTF-8/C/C/en_CA.UTF-8/en_CA.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] tools_2.11.1

Steven McKinney

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ATLAS BLAS

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