Typo in CNS calculation

[Willem Ferguson]

On 2019/08/09 23:23, Robert Helling wrote:
> Willem,
>
> could you please have a look at the final computation in 
> staticdoublecalculate_cns_dive(conststructdive*dive)
> in divelist.c
>
> It seems to me that the first minus in
>
> cns+=(double)t/((double)cns_table[j][SINGLE_EXP]-((double)po2i-(double)cns_table[j][PO2VAL])*(double)cns_table[j][SINGLE_SLOPE]/10.0)*100;
> should be plus (at least according to the formula in the comment above. At least, with this minus, you get negative CNS values for a planned air dive to 80m of depth.
> Best
> Robert
>
The reason for the negative value is because the dive plan involves pO2 
values above 1.6bar (EAN38 at 35m=pO2 of 1.7bar). The NOAA tables do not 
provide values above pO2 = 1.6.

I am working on a sensible solution because we need a sensible approach 
for this use case.

Kind regards,

willem



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