Spikes: Please try this patch

[Robert Helling]

Stefan,

> On 17. Sep 2017, at 22:47, Stefan Fuchs <sfuchs at gmx.de> wrote:
> 
> I see a somehow unexpected result:
> The situation that the plotted ceiling changes in respect to the spike being present or not when clicking at the dives in a different sequence is gone. So resetting additional things seems to be the correct approach because the result of the deco calculation really shouldn't depend on the sequence the dives are selected.
> 
> But: The spike is now only gone for the one specific dive (#710 in my example) where I discovered this "unstable" results. Many of my other dives now still always show such a spike at the beginning of the deco ceiling exactly as before.
> I have the fear we see two different issues here.
> I now discovered s.th <http://s.th/>. else which could help solving the issue: If a plan a dive in the planner the deco ceiling displayed shows no spike. If I save the dive and the very same profile is displayed outside the planner in the "normal" main window view the spike is there. I will send you some pictures tomorrow and try to generate some debug output.
> 
> One more important hint I maybe didn't mention up to now: The spikes in the profiles are only present if I enable " show ceiling in 3m steps".


Ah, that’s an important clue: Turning on the steps let’s be see the spike as well. Apparently, it comes from the 5min tissue which has a ceiling of a few centimetres which gets rounded to 3m.

We have to look into this a bit more to properly understand it. It could well come from the way that we adopted the VPM model to work for logged dives (which do not have a well defined bottom time and then stops). Maybe Rick has some ideas, he wrote that part.

Another observation:

Start from an empty log. Plan a VPMB+2 dive to 30m for 20m. -> no spike
Save. In the logbook, this dive has a spike.
Edit dive in planner, spike gone.
Save again, spike still gone.
Save to xml, quit subsurface
Open Subsurface with this dive: spike reappeaered.
Edit dive in planner: much less ceiling
Delete all computed waypoints ceiling normal again
Save, no spike

Best
Robert

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Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics
                      Scientific Coordinator
                      Ludwig Maximilians Universitaet Muenchen, Dept. Physik
                      Phone: +49 89 2180-4523  Theresienstr. 39, rm. B339
                      http://www.atdotde.de

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