bugGNU Octave - Bugs: bug #30686, possible bug in qhull

 
 

bug #30686: possible bug in qhull

Submitted by:  None
Submitted on:  Sun 08 Aug 2010 03:50:36 PM UTC  
 
Category: LibrariesSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Other
Status: Works For MeAssigned to: None
Originator Name: Sandeep GuptaOriginator Email: -unavailable-
Open/Closed: ClosedRelease: 3.2.0
Operating System: GNU/Linux

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Sun 08 Aug 2010 07:27:06 PM UTC, comment #1:

I can't confirm this bug with Octave 3.2.3 and Qhull 2009.1. I am running one Ubuntu version back at 9.10.

It is possible, perhaps, that the Ubuntu packagers have introduced a bug. To avoid that you might try compiling from source tarballs available at http://www.octave.org/download.html. If the problem persists with a fresh build from source then re-open this bug.

Rik <rik5>
Project Administrator
Sun 08 Aug 2010 03:50:36 PM UTC, original submission:

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

Anonymous

 

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  • -unavailable- added by rik5 (Posted a comment)
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    Follow 2 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sun 08 Aug 2010 07:27:06 PM UTCrik5StatusNone=>Works For Me
      Open/ClosedOpen=>Closed

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