[Octave-bug-tracker] [bug #33346] convhulln wrapper around qhull prevents non-simplicial facets

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?33346>

                 Summary: convhulln wrapper around qhull prevents
non-simplicial facets
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 19 May 2011 05:15:22 AM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Sean Pieper
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.4.0
        Operating System: GNU/Linux

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Details:

I see that there was a change made back in 2002 to make the default behavior
of convhulln generate simplicial facets, and to test that the results returned
by convhulln were simplicial. I have no issue with this as a default
behavior.

However, the error checking is done even when the user supplies their own
arguments to qhull. There are a lot of legitimate uses where a minimal set of
vertices is desired, not a minimal simplicial set, and the errors that get
thrown prevent convhulln from serving these cases.

My suggestion would be that the error checks be done only if the user does not
supply their own arguments to qhull.




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