[Octave-bug-tracker] [bug #30686] possible bug in qhull

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?30686>

                 Summary: possible bug in qhull
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 08 Aug 2010 03:50:36 PM UTC
                Category: Libraries
                Severity: 3 - Normal
              Item Group: Other
                  Status: None
             Assigned to: None
         Originator Name: Sandeep Gupta
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.0
        Operating System: GNU/Linux

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Details:

Hi,
 I am using octave 3.2 on ubuntu 10.04. I believe there is a bug in the
interface of  qhull. I ran the following code given as an example of the help
manual.

x = rand (1, 10);

y = rand (size (x));

T = delaunay (x, y);


However this gives me following error:



qhull internal error (qh_qhull): temporary sets not empty (2)

While executing: | qhull d Qt Qbb Qc

Options selected for Qhull 2009.1 2009/06/14:

delaunay Qtriangulate Qbbound-last Qcoplanar-keep _pre-merge

_zero-centrum Pgood Qinterior-keep _max-width 0.93 Error-roundoff 1.3e-15

_one-merge 9.1e-15 Visible-distance 2.6e-15 U-coplanar-distance 2.6e-15

Width-outside 5.2e-15 _wide-facet 1.6e-14

Last point added to hull was p9.

At error exit:

Delaunay triangulation by the convex hull of 10 points in 3-d:

Number of input sites: 10

Number of Delaunay regions: 0

Statistics for: | qhull d Qt Qbb Qc

Number of points processed: 10

Number of hyperplanes created: 27

Number of facets in hull: 16

Number of distance tests for qhull: 48

error: __delaunayn__: qhull failed.

error: called from:

error: /usr/share/octave/3.2.3/m/geometry/delaunayn.m at line 55, column 5

error: /usr/share/octave/3.2.3/m/geometry/delaunay.m at line 55, column 11



Not sure about the possible cause or if wrong version of qhull is used in
octave.


Thanks.
Sandeep




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