Mick Posted December 11, 2022 Share Posted December 11, 2022 can some one please explain what these actually do when using a histogram? Std dev: Filter - I assume this filters possibly what is entered into the Std dev box? Sample - I think that is self explanatory Ignore - ignore what? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 11, 2022 Share Posted December 11, 2022 Ignore will hide any cells with a cell count < "samples". Filter will drop any samples from the bucket where the standard deviation is outside of "std dev". Standard deviation is very useful to determine if you have highly non correlated or bad data. It is also great for filtering out noise due to transient data or slow logging rates. I did a write up on it here a long time ago. https://forum.hptuners.com/showthread.php?58174-Custom-graphing-software-for-logging-fuel-trims-and-recalculating-speed-density-maps Basically the short of it is your Z data should be highly correlated with your X and Y data, eg all the values collected are roughly the same, eg the min/max are very close together. If you had 1000 samples within a specific cell, all are roughly 0->0.1 and then 20 random samples is 1000 due to a sensor fault, the 1000 would have a huge standard deviation and the value would be dropped. This would also be excluded from the average value calculation. https://en.wikipedia.org/wiki/Standard_deviation The number at the bottom is the standard deviation. So if you want to drop transient data from your log and only use the steady state data you might use a tight standard deviation of 1. If you want the extreme min/maxs you might go as high as 3. 1 2 Quote Link to comment Share on other sites More sharing options...
Mick Posted December 13, 2022 Author Share Posted December 13, 2022 Is there any plans to have Histograms use filters? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 13, 2022 Share Posted December 13, 2022 4 hours ago, Mick said: Is there any plans to have Histograms use filters? Unfortunately Matt has moved on to another job so datalogger development will likely be halted until we can afford more employees. We will continue to fix bugs however there won't be any new major features in the short term. 1 Quote Link to comment Share on other sites More sharing options...
Mick Posted December 13, 2022 Author Share Posted December 13, 2022 30 minutes ago, Roland@pcmtec said: Unfortunately Matt has moved on to another job so datalogger development will likely be halted until we can afford more employees. We will continue to fix bugs however there won't be any new major features in the short term. thank you for the honest reply 1 Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted December 13, 2022 Share Posted December 13, 2022 1 hour ago, Roland@pcmtec said: afford more employees What does someone need to learn and how long to learn it before they'd be any good as an intern? 1 Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 13, 2022 Share Posted December 13, 2022 13 hours ago, Puffwagon said: What does someone need to learn and how long to learn it before they'd be any good as an intern? Have 5 years of prior programming experience and either a bachelors in computer science or engineering. Most of us have 15+ years experience writing software. Darryl started in the 80s and you could say he has 40+ You actually don't need to know anything about cars to do most of what we do. Definitely helps if you do though! 3 Quote Link to comment Share on other sites More sharing options...
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