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List:       r-sig-mac
Subject:    Re: [R-SIG-Mac] Lapack errors on Mac but not on Linux
From:       Gad Abraham <gabraham () csse ! unimelb ! edu ! au>
Date:       2008-12-10 23:49:04
Message-ID: 49405570.1070409 () csse ! unimelb ! edu ! au
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Prof Brian Ripley wrote:
> 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 Abraham
Dept. CSSE and NICTA
The University of Melbourne
Parkville 3010, Victoria, Australia
email: gabraham@csse.unimelb.edu.au
web: http://www.csse.unimelb.edu.au/~gabraham

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