* Curtis Olson -- Monday 14 April 2008:
> Let's say I want to do a simple moving average ... so the new value is
> (let's say) 9 parts the previous filtered value + 1 part of the latest
> sensor reading.  Doing that as a simple average though will glitch if your
> values are coming in around 0/360.

FlightGear has an aircraft.angular_lowpass() in $FG_ROOT/Nasal/aircraft.nas.
It filters sin() and cos() separately, and builds the angle from that again.
Worked well in my tests.

m.

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