#585 was: Quick update

[Rick Walsh]

Robert,

On 3 July 2014 22:21, Robert Helling <helling at atdotde.de> wrote:
> Dirk,
>
> when you are done, could you help me with #585? The problem seems to be the
> following:
>
> in divelist.c there is the function init_decompression() which is supposed
> to go through the dive list and find dives that still influence tissue
> loadings of the current dive (in this case: in the planner). The rule is
> that we assume that after 48h all tissues are back to their surface values.
> So from the current dive we go back in time to find a surface interval of at
> least 48 hours. After that interval we take all the tissue loadings into
> account. There seem to be two problems:

Is this more complicated than it needs to be? If the tissue loading
decays sufficiently in 48 hours as to be insignificant if there have
been no dives since, is tissue loading from a dive 48 hours ago
significant if there have been subsequent dives?

>
> 1) A minor one: the “going back in time” is done as a loop with
>
> while (i && —i)
>
> where i is the index in the dive list. Here, it seems to me i==0 is a
> perfectly fine value, it is the first entry in the dive list. So the
> condition should rather be
>
> while (i >= 0 && --i >= 0)
>
> Could somebody please confirm/refute this?
>
> 2) In the planner (this is why I write this), there seems to be a bogus dive
> in the dive list present which seems to be related to the dive that is
> currently planned and which for me is exactly one hour before the default
> date of the planner (i.e. now). That dive is then counted as influencing the
> deco of the planned one which is of course wrong. It seems to me this is one
> of the “staging dive” or “current dive”. As I know you are looking into
> this, I will not try to mess with trying to get rid of this dive or ignore
> it for pre saturation of tissues. May I just draw your attention to this
> problem and ask you to tell me when your open heart surgery has stabilized
> enough for me to further investigate this point?
>
> Thanks
> Robert
>
>
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> Robert C. Helling     Elite Master Course Theoretical and Mathematical
> Physics
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