[Rd] is.Rs_own_BLAS() ?

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Jun 21 19:35:48 CEST 2006

On Wed, 21 Jun 2006, Martin Maechler wrote:

> Does anyone see a nice portable way to detect --- from inside R ---
> if R is using its own BLAS or not?
> { And ideally, if not, can R find out which ``kind'' of
>  (optimized) BLAS it does run? }
> And the same for LAPACK ?
> One way of getting a partial answer seems to be
> Rs_own_LAPACK_and_BLAS <-
>    list.files(file.path(R.home(), "lib"), pattern = "^libRlapack") > 0
> (where I'd be grateful for confirmation from a Mac and a Windows user
>  that the above does work)

Not possible: R on Windows has a plug-in BLAS, and Simon has asked for the 
same on MacOS X.  And the BLAS and LAPACK are DLLs stored in R_HOME/bin, 
not import libraries stored on R_HOME/lib (which no longer exists).

There are even architecture-specific Rblas.dll on CRAN (and have been for 
some years).


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

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