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Re: [igraph] bug in Graph.community_leading_eigenvector?

From: Tamas Nepusz
Subject: Re: [igraph] bug in Graph.community_leading_eigenvector?
Date: Mon, 24 Mar 2008 18:49:59 +0100

You have to set maxiter. iter is a read-only attribute which contains the number of iterations reached at the last invocation of an ARPACK- based routine.


On 2008.03.24., at 18:46, Kurt J wrote:
Sounds simple enough, however i'm not clear on how i set the values

>>> igraph.arpack_options.iter
>>> igraph.arpack_options.iter=5000
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: iter

On Mon, Mar 24, 2008 at 4:31 PM, Tamas Nepusz <address@hidden> wrote:

> Using igraph 0.5 in python 2.5 in osx 10.4, i'm running the
> leading_eigenvector community detection method and I get the
> following warning:
Eigenvector calculations in igraph 0.4.5 were not based on ARPACK, so
that's the cause why there's no warning in 0.4.5. I can't judge
whether the result of 0.4.5 is correct or the result of 0.5; but maybe
raising the maximum number of iterations allowed in the ARPACK module
will help. The Python interface has a variable called arpack_options,
which is an instance of class ARPACKOptions (see
help(arpack_options)). arpack_option has an attribute called maxiter
(which is 3000 per default) that can be modified to allow more
iterations. Maybe this helps, maybe not.


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