Re: octave 5.1.90 make test "fail"

[Christian Himpe]

On Sat, 18 Jan 2020 14:54:46 +0900
Kai Torben Ohlhus <address@hidden> wrote:

> On 1/18/20 9:40 AM, Christian Himpe wrote:
> > Dear Developers,
> > 
> > Testing Octave 5.1.90 via make test, I got a FAIL for
> > "camlookat.m"; from the "fntest.log":
> >   
> >>>>>> processing 
> >>>>>> /home/ch/BUILA/octave-5.1.90/scripts/plot/appearance/camlookat.m  
> > ***** test
> >  hf = figure ("visible", "off");
> >  unwind_protect
> >    [x y z] = sphere ();
> >    h1 = surf (x + 1, y, z);
> >    hold on
> >    h2 = surf (x - 1, y + 2, z + 1);
> >    dir = camtarget () - campos ();
> >    dir /= norm (dir);
> >    camlookat (h1);
> >    dir2 = camtarget () - campos ();
> >    dir2 /= norm (dir2);
> >    assert (dir, dir2, -2*eps);
> >    camlookat (h2);
> >    dir2 = camtarget () - campos ();
> >    dir2 /= norm (dir2);
> >    assert (dir, dir2, -2*eps)
> >    camlookat ([h1 h2]);
> >    dir2 = camtarget () - campos ();
> >    dir2 /= norm (dir2);
> >    assert (dir, dir2, -2*eps);
> >  unwind_protect_cleanup
> >    close (hf);
> >  end_unwind_protect
> > !!!!! test failed
> > ASSERT errors for:  assert (dir,dir2,-2 * eps)
> > 
> >   Location  |  Observed  |  Expected  |  Reason
> >     (2)        0.72803      0.72803      Rel err 4.5749e-16 exceeds
> > tol 4.4409e-16 by 1e-17
> > 
> > 
> > Maybe the relative error needs to be raised by a small bit here?
> > 
> > Best
> > 
> > Christian
> >   
> 
> Thank you for reporting this.  I guess you are using some Linux,
> right? Is there anything specific about your system setup what might
> cause this tiny difference?
> 
> Does this also happen for 5.1.0 or the current development version?
> Does this test always fail when explicitly call it several times from
> the GUI and CLI by
> 
>    test camlookat
> 
> I think 2*eps or 4*eps is just cosmetic and we should not change for
> 5.2.0.  But if it occurs in Octave 6, can you please file a bug report
> about it?
> 
> Thanks,
> Kai
> 

Dear Kai,

indeed I am on Ubuntu 18.04, it is a quite custom software stack and it
does not happen for 5.1. It is reproducible though under 5.1.90. I will
report if this shows up in 6.0.90.

Best

Christian


-- 
Dr. rer. nat. Christian Himpe
Computational Methods in Systems and Control Theory
Max Planck Institute for Dynamics of Complex Technical Systems
Sandtorstr. 1
39106 Magdeburg
Germany
https://himpe.science