On 12/03/2015 13:43, Tom?? Greif wrote:> How BLAS and LAPACK are related, does R need both?
Both.
>
> I am trying to understsand different BLAS options in R and I am quite not
> sure if LAPACK is part of BLAS, or separate library or something else.
> Based on http://www.netlib.org/lapack/ it looks like LAPACK is some kind of
> BLAS extension ("LAPACK routines are written so that as much as
possible of
> the computation is performed by calls to the Basic Linear Algebra
> Subprograms (BLAS)").
No, LAPACK is a set of routines distinct from BLAS. However, the
standard LAPACK tarball includes a reference set of BLAS routines which
are also available separately. Hence some confusion. But the confusion
is that BLAS is part of LAPACK, not v.v.
This is not an R-help topic (see the posting guide, including what it
says about HTML mail).
>
> Tomas
>
> [[alternative HTML version deleted]]
>
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK