[Octave-bug-tracker] [bug #58672] Qhull messages during __run_test_suite__

[Philip Nienhuis]

URL:
  <https://savannah.gnu.org/bugs/?58672>

                 Summary: Qhull messages during __run_test_suite__
                 Project: GNU Octave
            Submitted by: philipnienhuis
            Submitted on: Mon 29 Jun 2020 11:37:04 AM CEST
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Other
                  Status: None
             Assigned to: None
         Originator Name: Philip Nienhuis
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any

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Details:

Since several months I get the following Qhull messages during 
__run_test_suite__.m  on Windows:

:
  geometry\delaunay.m ............................................QH6019 qhull
input error (qh_scalelast): can not scale last coordinate to [   0, 1].  Input
is cocircular or cospherical.   Use option 'Qz' to add a point at infinity.

While executing:  | qhull d Qt Qbb Qc
Options selected for Qhull 2019.1 2019/06/21:
  run-id 1503097439  qh_QHpointer  delaunay  Qtriangulate  Qbbound-last
  Qcoplanar-keep  _pre-merge  _zero-centrum  Qinterior-keep  Pgood
  _maxoutside  0
QH6019 qhull input error (qh_scalelast): can not scale last coordinate to [ 
0,    1].  Input is cocircular or cospherical.   Use option 'Qz' to add a
point at infinity.

While executing:  | qhull d Qt Qbb Qc
Options selected for Qhull 2019.1 2019/06/21:
  run-id 1503097439  qh_QHpointer  delaunay  Qtriangulate  Qbbound-last
  Qcoplanar-keep  _pre-merge  _zero-centrum  Qinterior-keep  Pgood
  _maxoutside  0
 pass   15/15
:
:
:
  geometry\griddatan.m ...........................................QH6239 Qhull
precision error: in
itial Delaunay input sites are cocircular or cospherical.  Use option 'Qz' for
the Delaunay triang
ulation or Voronoi diagram of cocircular/cospherical points; it adds a point
"at infinity".  Alter
natively use option 'QJ' to joggle the input.  Use option 'Qs' to search all
points for the initia
l simplex.

input sites with last coordinate projected to a paraboloid
- p3(v4):     1     0   0.5
- p2(v3):     0     1   0.5
- p1(v2):     1     1     1
- p0(v1):     0     0     0

While executing:  | qhull d Qt Qbb Qc
Options selected for Qhull 2019.1 2019/06/21:
  run-id 1503215088  qh_QHpointer  delaunay  Qtriangulate  Qbbound-last
  Qcoplanar-keep  _pre-merge  _zero-centrum  Qinterior-keep  Pgood
  _max-width  1  Error-roundoff 1.4e-015  _one-merge 9.7e-015
  Visible-distance 2.8e-015  U-max-coplanar 2.8e-015  Width-outside 5.5e-015
  _wide-facet 1.7e-014  _maxoutside 1.1e-014
 pass   15/15
:


I know about bug #57703 but that one had been closed as fixed. In addition all
tests do pass here. In bug #57703 I read nothing about these remaining
messages.
So seemingly these are just cosmetic issues but unnecessarily verbose IMO.
BIST test adaption required? Is there a way to silence Qhull?

My mxe-octave build tree is up-to-date. On Mageia 7 Qhull is at 2015.2





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