Re: Continuing Octave graphics problems

[Sebastian]

Dear Edmund, 

On 2016-08-02, edmund ronald <address@hidden> wrote:
> 
> I think you've been watching too much TV with Mr. Trump, my name is Ronald, 
> and people usually call me Edmund. :)
Sorry, mea culpa. You recently corrected somebody who addressed you with 
"Ronald"; so I think this is called a Freudian slip. - At least I recalled that 
"Ronald" was wrong :)

> I haven't verified the qt bug on Ubuntu. If you have a link to an easy 
> script, I can run it in the VM; AFAIK the Octave version which is now on 
> "stable" is 4.02.
Find attached the code of Vic. On Mac and windows screen output und pdf look 
different.

> I would be more worried that we might have some numerical disparities between 
> platforms; in fact we did some research at the Applied Maths Lab of Ecole 
> Polytéchnique, and found that numerical disparities are to be expected 
> between platforms and even software upgrades, for just about any code. 
These problems increase with the complexity of any code, see e.g. [1] for a 
recent publication on this matter. However, basic stuff should be covered by 
tests. Actually our test work much better on numerics than on images...

Sebastian

[1] 
http://lorenabarba.com/news/reproducible-and-replicable-cfd-its-harder-than-you-think/

octave-graphics-problems.tar.gz
Description: GNU Zip compressed data

> On Tue, Aug 2, 2016 at 4:27 PM, Sebastian <address@hidden> wrote:
> 
> On 2016-08-02, edmund ronald <address@hidden> wrote:
> >
> > Hi Vic,
> >
> >  If you need to use a Mac you could use my seamless VM installer which is 
> > also linked to off the wiki http://wiki.octave.org/Octave_for_MacOS_X.
> >  This version of Octave *is* the Ubuntu stable version, and *should* 
> > provide you with good graphics although one user has complained recently of 
> > a failure we cannot trace.
> 
> Hi Donald,
> 
> did you verify that the qt bug is not present on Ubuntu?
> 
> Seb.