VPM support

[Robert C. Helling]

On Thu, 14 Mar 2013, filippom at gmail.com wrote:

> On 14/03/2013 11:54, Robert C. Helling wrote:
>>
>> It is still on my todo list to understand how VPM works. And the C
>> source is machine converted from FORTRAN. So it's probably better to
>> directly read the original version.
>>
>
> Here:
> http://www.decompression.org/maiken/VPM/VPM_Publications.htm
>
> There is a lot of stuff (article , code ... )

I know that website. If you can make sense of it go ahead and code it! I 
think a good starting point is the 55 page FORTRAN program. For 
comparison: Our Buehlmann with GF's implementation is 6 pages.

With the time I have invested so far I was not able to really understand 
what is going on. And without that I would want to put out anything that 
people might actually use in their diving.

And, as I have said earlier on this list, I do not believe that VPM (or 
any similar algorithm) assuming it is correctly implemented gives profiles 
that differ more from GF calculations than the empirical uncertainty (how 
well are the parameters of the model established by 
observations/experiments) anyway. Note well that "with this dive I stayed 
inside the bounds of that model and did not get bent" is not a sufficent 
confirmation of parameters as it does not tell you that you couldn't have 
done a shorter deco and did not get bent either. What you really wanted to 
do is to find the boundary of the "I do get bent only with acceptably low 
probability" regime. And that for all kinds depth/time combinations. 
Additional bonus for multilevel and repetitive diving.

Best
Robert

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