[R-SIG-Mac] Lapack errors on Mac but not on Linux

[Prof Brian Ripley]

On Tue, 9 Dec 2008, Gad Abraham wrote:

> Prof Brian Ripley wrote:
>>> Is this an issue with the Apple-supplied Lapack?
>> 
>> Or the Apple-supplied BLAS.
>> 
>> You have not told us how R was built on your machine, but if this was the 
>> CRAN build you have a choice of BLAS.  (See the list archives, but AFAIR, 
>> you can swap links between libRblas.0dylib and libRblas.veclib.dylib in 
>> /Library/Frameworks/R.framework/Resources/lib.)  (On that build AFAICS the 
>> Lapack used is the R one.)
>
> Both are from CRAN.
>
>> 
>> I think your example is actually random (it uses 10-fold CV?) in which case 
>> that might have been the difference between machines.
>
> I get consistent failures on Mac, and it works consistently on Linux.
>
>> 
>> With a lot of patience, I got the example to run on my own build which uses 
>> the recipe in the R-admin manual (veclib for both BLAS and LAPACK). With 
>> the CRAN build of R using libRblas.0.dylib, it ran for a lot longer than 
>> with libRblas.veclib.dylib, but eventually gave the same error.
>> 
>
> For me, switching to libRblas.0.dylib seems to solve the problem, no more 
> LAPACK errors. Is this a permanent solution? Will switching BLAS break 
> anything in the Accelerate framework?

It is permanent.  See
http://cran.r-project.org/bin/macosx/RMacOSX-FAQ.html#Which-BLAS-is-used-and-how-can-it-be-changed_003f



>
> Thanks,
> Gad
>
>
> -- 
> Gad Abraham
> Dept. CSSE and NICTA
> The University of Melbourne
> Parkville 3010, Victoria, Australia
> email: gabraham at csse.unimelb.edu.au
> web: http://www.csse.unimelb.edu.au/~gabraham
>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595