[SciPy-User] segfault using _sparse_ svd, eigen, eigen_symmetric with svn 0.9.0.dev6598

Pauli Virtanen pav@iki...
Wed Jul 21 16:10:09 CDT 2010

Wed, 21 Jul 2010 17:59:45 +0200, Jose Quesada wrote:
> We are getting segfaults using _sparse_ svd, eigen, eigen_symmetric with
> svn 0.9.0.dev6598. I understand that (1) this is an unreleased version,
> and (2) these methods may depend on external C and fortran code that
> could have not being installed well on my machine, so this may be
> difficult to debug. I have added instructions to reproduce the segfault,
> but please ask for anything else that could be needed and I'll try to
> provide it.

The example code runs without segfaults for me, on Python 2.6 + 32-bit 
linux, and Python 2.5 + 64-bit linux. That part of scipy.sparse AFAIK 
does not use external code, ARPACK is bundled, so that's probably not an 

I'd perhaps first try just removing the Scipy and Numpy installations, 
and getting the source codes and rebuilding them "manually", via

	svn co http://...
	python setup.py install  > build.log 2>&1

rather than using Pip or relying on some other automagical system. (I'd 
also record the build logs and post again here if this didn't help :)

Pauli Virtanen

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