Does anyone know of a simple algorithm to calculate the difference between
the desired heading and the actual heading, where the angle is given in
degrees from 0 to 260? The stipulations are that the result must be <= 180.
For example, you can go from 60 to 340 degrees (counter-clockwise), 110 to
280 (clockwise), 290 to 40 (clockwise), etc. The desired result in the
first case is -80, in the second case, 170, and for the last case, 110. And
so on ...

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The ideal algorithm will have the fewest trivial operations.
Jon
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