[SciPy-User] understanding machine precision

Francesc Alted faltet@pytables....
Tue Dec 14 13:29:17 CST 2010


A Tuesday 14 December 2010 20:17:10 Nils Wagner escrigué:
> Hi all,
> 
> I am using ATLAS
> 
> python -i try_deterministic.py
> 
> lstsq
> 0.0
> 0.0
> 0.0
> 0.0
> 0.0

That's interesting.  Maybe Josef is using a threaded ATLAS?  I 
positively know that threading introduces variability in the order that 
the computations are done.  However, I'm not sure on why ATLAS has 
decided to use several threads for so small matrices ((100, 10)) :-/

-- 
Francesc Alted


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