bucketizer.mean.circular function returns the the circular mean of all the values found in the bucket.
The associated location is the centroid of all the encountered locations. The associated elevation is the mean of the encountered elevations.
bucketizer.mean.circular function can only be applied to values of type LONG or DOUBLE, when applied to STRING
or BOOLEAN it does not return any value.
If any tick is undefined, no value will be returned. Use
bucketizer.mean.circular.exclude-nulls if your GTS contain nulls.
bucketizer.mean.circular function expects a positive, finite, numeric period on top of the stack, this period will be
used to determine the span of circular values, use for example 360.0 if you wish to compute the circular mean of degree angles.