[SciPy-User] qHull zero division error, scipy 0.10.1, linux

David Baddeley david_baddeley@yahoo.com...
Tue Aug 7 17:24:52 CDT 2012

Many thanks for taking the time to look at this. Was hoping someone had already come across it, but seems I'm out of luck. Having delved into the internals of qHull before in a separate project I don't relish the prospect. Am beginning to suspect there is some funny compiler problem/interactions with old numpy/scipy verisons as an extension module of mine (using the numpy c api) which previously ran fine is now also failing. Will try downloading the tarballs and compiling from them after deleting any previous versions rather than using easy_install.


 From: Pauli Virtanen <pav@iki.fi>
To: scipy-user@scipy.org 
Sent: Tuesday, 7 August 2012 8:38 AM
Subject: Re: [SciPy-User] qHull zero division error, scipy 0.10.1, linux
05.08.2012 17:41, Ralf Gommers kirjoitti:
> On Tue, Jul 31, 2012 at 2:42 AM, David Baddeley
>     before I download the source and start messing with qhull.pyx / the
>     qhull sources themselves. I thought I'd ask if there were any known
>     bugs / clues.
> I can't reproduce this with current master and it doesn't look familiar.
> There were some fixes to qhull though for 0.11, so I'd check first if
> those fixed your issue.

This seems like a failure occurring inside Qhull --- the scale
parameters seem to not have been computed for a reason or another.

I haven't seen any reports about anyone else seeing such a failure
before, so compiler problems may also come into question.

Pauli Virtanen

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