Re: Qhull test changes

[Ben Abbott]

On Jan 30, 2012, at 7:42 PM, Brad Barber wrote:

> At 07:32 PM 1/30/2012, Ben Abbott wrote:
> 
>> On Jan 30, 2012, at 7:15 PM, Alexander Hansen wrote:
>> 
>>> On 1/30/12 6:02 PM, Rik wrote:
>>> 
>>> <snip>
>>> 
>>>>> I'm not certain, but doesn't "Qt" imply that the convex hull
>>>>> should be made up of triangles ? (perhaps I should study the
>>>>> qhull docs a bit ?)
>>>>> 
>>>>> In any event, I favored the more recent qhull because it matches
>>>>> Matlab's result.
>>>>> 
>>>> Yes, the output should be triangulated when we pass the 'Qt' option
>>>> and the new post-2011 Qhull behavior is mathematically correct.
>>>> The problem is that Qhull is not returning triangulated output for
>>>> versions less than 2011 and users will blame Octave when they see a
>>>> failing test in the test report.  I am proposing that Octave work
>>>> around the different Qhull versions so we don't generate a lot of
>>>> spurious bug reports.
>>>> 
>>>> On the other hand, if we want we could leave the test in and also
>>>> put in some comments that specifically say, "If you see this test
>>>> failing, then you must upgrade your Qhull installation."  This
>>>> might do a bit towards pushing users and distributions to upgrade
>>>> to a new Qhull.
>>>> 
>>>> --Rik
>>> 
>>> Excuse me jumping in, but does this indicate that I should be using
>>> qhull>=2011 for my Octave-3.4.3 and Octave-3.6.0 Fink packages?  I've
>>> been using 2009.3.
>>> 
>>> -- 
>>> Alexander Hansen
>>> Fink User Liaison
>> 
>> To use qhull 2011 a patch is needed. 2009, 2010, or 2012 should each be ok. 
>> The problem appears to be in the tests Octave runs (i.e. make check)
>> 
>> Ben
> 
> I hope that all builds of Octave upgrade to 2012.1.  There's a serious bug 
> with 2009.1 and other bugs fixed in 2011.2 and 2012.1.  For details, see
>   http://gitorious.org/qhull/qhull/blobs/master/src/Changes.txt
> 
>                                --Brad

Is there a simple way to test for the serious 2009 bug ? Something that could 
be added to the configure process?

Ben