On Mon, 14 Apr 2008, Melchior FRANZ wrote:

>* Curtis Olson -- Monday 14 April 2008:
>> Let's say I want to do a simple moving average ...
>
>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.

This sounds close to what I was going to suggest - summing/averaging unit
vectors.  The vectors could proportional to speed if desired.

In general, unit vectors are a good way of dealing with circular
distributions (they work well for statistical analysis of time-of-day
studies, where 2359 and 0001 need to be two minutes apart, not 1338).

--
Mike Schuh - Seattle, Washington USA
http://www.farmdale.com

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