[Numpy-discussion] Numeric to numarray experiences

Todd Miller jmiller at stsci.edu
Tue Oct 5 13:37:42 CDT 2004


On Tue, 2004-10-05 at 16:00, Darren Dale wrote:
> On Tuesday 05 October 2004 03:17 pm, Stephen Walton wrote:
> > On Tue, 2004-10-05 at 10:41, Raik Grünberg wrote:
> > > Our sysadmin noted that unlike Numeric, numarray is not using any
> > > external math libraries (like LAPACK) that have been speed-optimized for
> > > decades and are available in CPU-optimized variants (e.g. ATLAS). It's
> > > probably difficult to match this efficiency with any new code ...
> >
> > This is a key point.  Have a look at addons.py in numarray, some
> > previous comments on this list, and build numarray with the line
> >
> > env USE_LAPACK=1 python setup.py build
> >
> > after editing addons.py appropriately.  You should see a major speed
> > improvement.
> 
> I would kindly suggest updating the numarray documentation. 

Thanks, will do.

> In the section on 
> installation, it is easy to overlook the option to compile againist existing 
> libraries. That is explained in section 16, which appears to be out of date. 
> The code listed in Packages/LinearAlgebra2/setup.py has been moved to 
> addons.py, correct?

That's correct.

Regards,
Todd





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