Maths Q? Time in seconds a channel is above 'x' value

Discussion and support for i2 Standard and i2 Pro applications

Maths Q? Time in seconds a channel is above 'x' value

Postby Sean on Sat Oct 31, 2015 2:28 pm

Hi all, I'm trying to work out how to calculate how many seconds per lap the front brake temperature is above 750 C. The following gives me a reading in seconds if i set the units correctly, but it isn't right, seems to be underestimating....
integrate('Brake Temp Front' [C],'Brake Temp Front' [C] >= 750,range_change("Outings:Laps"))

I am using this to get a percentage of lap time, the figure makes more sense, but I don't know if this is right either.....
stat_mean('Brake Temp Front' [C] >=750, 1, range_change("Outings:Laps"))*100

I've been trying to muddle my way through using information gleaned from here, but with these advanced (to me anyway) statistical kinds of functions I am somewhat lost :oops:

Thanks for your help, Sean.
Sean
 
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Joined: Sun Dec 21, 2008 12:35 pm
Location: Adelaide or Auckland

Re: Maths Q? Time in seconds a channel is above 'x' value

Postby adrian on Fri Nov 06, 2015 10:51 am

Hi Sean,

Try this instead:

integrate('Brake Temp Front' [C] >= 750, 1, range_change("Outings:Laps"))

The easiest way to get a percentage that the brake temp is above 750 would be to use the max of the above calculated time and divide it by lap time (if it is logged).

Adrian
adrian
MoTeC
 
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Re: Maths Q? Time in seconds a channel is above 'x' value

Postby Sean on Fri Nov 06, 2015 12:32 pm

Excellent, thanks Adrian! The percentage is not important, was only trying that because of my ineptitude in making the time calculation work. Now to work on reducing the numbers ;)
Sean
 
Posts: 254
Joined: Sun Dec 21, 2008 12:35 pm
Location: Adelaide or Auckland


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