[R] atlas for R1.1.1 and R1.2 different?

Kurt Hornik Kurt.Hornik at ci.tuwien.ac.at
Tue Nov 14 14:56:52 CET 2000

>>>>> Marcus Eger writes:

> Douglas Bates wrote:
>> I don't think the presence or absence of atlas should affect the
>> results from integrate.  The atlas library is an enhanced, faster
>> version of the basic linear algebra subroutines (blas) and a few of
>> the lapack subroutines.  Unless the C code in integrate is calling
>> these subroutines explicitly, atlas should not affect the results.

> An example for the different behaviour is the following:

> ...
> I'm wondering why the same integrate package under R1.1.1 uses atlas,
> but under R1.2 it doesn't.

The configure detection of fast BLAS libraries is different between
these versions, but I don't think that this is the reason.

I suspect that your R 1.1.1 is from a .deb file which requires package
atlas2, and the R 1.2.0 is compiled from source but cannot find atlas
(look at config.log) because package atlas2-dev is not installed.



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