[PATCH] CCR Import from CSV: Calculate correct nitrogen and helium gas pressures

[Willem Ferguson]

On 03/11/2014 11:59, Paul Sargent wrote:
> On 3 Nov 2014 08:35, Robert Helling <helling at atdotde.de> wrote:
>>
>> On 03.11.2014, at 09:26, Willem Ferguson <willemferguson at zoology.up.ac.za> wrote:
>>
>>> You guys have the experience. Please advise??  Robert, your opinion?
>>
>> IMHO having special, hardcoded meanings for 0 and 1 is bad and also for the future having symbolic names is much better even if at the moment they always have the values 0 and 1.
> I would agree. If someone is planning a dive or entering gases manually then fixed indices well be a total pain.
>
> Paul

Paul,
Currently, when CCR data files are imported, cylinder 0 is used for 
oxygen because that is probably the single least variable among 
different CCR systems. Then cylinder 1 is used for the diluent gas 
because all CCR systems require a diluent gas. When it comes to other 
additional cylinders I agree that almost unlimited freedom should exist. 
But as far as the cylinders are concerned that are monitored by the CCR 
computer(s), cylinders 0 and 1 are dedicated because that is with what 
one has to start off with. Does this bring about any specific 
difficulty, even in using the planner? How would a Shearwater diver 
think about these issues?

Now please do not deduce that I am trying to make a case for hard 
coding. Not at all. I am trying to discover how other CCR divers think 
that have a totally different frame of mind from what I am thinking 
about, because this might bring me new insights. Please comment, will you?
Kind regards,
willem