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[Octave-bug-tracker] [bug #54896] voronoi produces no edges for provided
From: |
Pantxo Diribarne |
Subject: |
[Octave-bug-tracker] [bug #54896] voronoi produces no edges for provided data |
Date: |
Thu, 25 Oct 2018 11:57:08 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0 |
Follow-up Comment #1, bug #54896 (project octave):
I think this is an invalid input (what kind of voronoi cell would you expect
from collinear points?) and voronoin fails as I would expect:
>> x = [8, 16, 32, 64]
>> y = [61.0, 122.0, 244.0, 488.0]
>> voronoin([x' y'])
QH6239 Qhull precision error: Initial simplex is cocircular or cospherical.
Use option 'Qz' for the Delaunay triangulation or Voronoi diagram of
cocircular/cospherical points. Option 'Qz' adds a point "at infinity". Use
option 'Qs' to search all points for the initial simplex.
While executing: | qhull v Qbb
Options selected for Qhull 2015.2 2016/01/18:
run-id 824596463 voronoi Qbbound-last _pre-merge _zero-centrum Pgood
_max-width 4.3e+02 Error-roundoff 6.8e-13 _one-merge 4.7e-12
_near-inside 2.4e-11 Visible-distance 1.4e-12 U-coplanar-distance 1.4e-12
Width-outside 2.7e-12 _wide-facet 8.1e-12
error: voronoin: qhull failed
error: called from
voronoin at line 73 column 12
Probably the only bug here is that voronoi fails silently instead of firing an
explicit error.
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