[SciPy-user] eigenvalues of sparse matrix

David Grant david at dwavesys.com
Thu Oct 28 12:32:44 CDT 2004

Travis Oliphant wrote:

>> Does anyone know how much work it would be to get ARPACK support in 
>> scipy?  Even just minimal support.  This is totally new ground for 
>> me, so I'd like to know if I'm biting off more than I can chew.
> After looking over ARPACK, it looks to me that you could get a 
> functional ARPACK interface in 1-2 days, using f2py.   Then, you could 
> look at the linalg/iterative  methods that interface with  
> reverse-communication fortran code to get an idea how you might write 
> simpler Python wrappers to the raw wrappers produced by f2py. 

So use f2py.  Then look at the stuff here: *http://tinyurl.com/3uzmy* to 
figure out how to get reverse-communication to work, then write 
higher-level code which talks to the python code generated by f2py?

> I don't think this would be hard at all.  It would be a good way for 
> you to learn f2py, if you are not already familiar with it.  Also, you 
> might notice how iterative and sparse f2py interfaces use a (very 
> simple) templating mechanism  (in scipy_distutils/from_template.py)  
> so that interfaces for all four precisions are maintained with a 
> single code-base.
> But, if you produce an interface for the precision you care about, I 
> could handle converting it to a general-purpose interface for all 
> precisions.


> Is the ARPACK code distributible in Python?
ARPACK is "freely distributable" or "public domain".  I've seen both of 
these used to describe ARPACK's license or lack-therof.

David J. Grant
Scientific Officer
Intellectual Property
D-Wave Systems Inc.
tel: 604.732.6604
fax: 604.732.6614


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