Deco calculation oddities..

Robert C. Helling helling at
Fri Feb 8 03:00:09 PST 2013

On Fri, 8 Feb 2013, Linus Torvalds wrote:


> IOW, I am much happier seeing that there is no long-term state that is
> affected by the whole gradient factor, because that fundamentally
> makes it a sensible operation to look at the same tissue loading state
> using two different gradient factors.

Thinking about this a bit more, I just realized that there is a little bit 
of memory involved: It comes in with lowest_ceiling: GF_low is supposed to 
apply at the depth of the deepest deco stop (and not at the max_depth as 
it was in my first version of deco.c). For the linear interpolation of 
gradient factors we need to memorize this value.

And I would say this this depth should have no influence on the no flight 
time. This is another reason to use for that calculation GF_high=GF_low = 
(either 100% for plain vanilla Buehlmann or some reasonable GF_high like 
80% or so). Having both equal makes, as I said earlier, the gradient 
factor independent of the ambient pressure.


Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics
                       Scientific Coordinator
 		      Ludwig Maximilians Universitaet Muenchen, Dept. Physik
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