The problem is the discontinuity in the number system being used. Creating a continuous wrap around number system representing the compass as 0 to 179 180 -179 to -1 makes all of the averaging problems go away. Conversion of negative numbers requires a
simple add of 360.

w..


Dave VanHorn wrote:
> 
> >Excellent!  I hadn't thought of it that way.  A little too much math for some situations, but certianly a perspective worth keeping in mind when running into such a situation.
> 
> This sounds like a problem I faced a while back, averaging compass headings.
> 90,89,91 averages to 90, no problem, but 359,0,1 averages to 180 which is dead wrong.
> 
> What I did, was to convert the polar coordinates to rectangulars, then add them, then convert back to polar.
> 
> I had to do 7200 of these every second, while dealing with a ton of serial traffic as well, on nine ports.
> 
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