Picking random vectors is problematic -- what's the distribution? If we settle on random unit vectors, wlog we can make one of them (0,0,0,1). Then the cosine of the angle between them is the w coordinate of the other. Positive and negative w's are equally likely, and (arccos(w)+arccos(-w))/2 = pi/2 for all -1<=w<=1, so the average is pi/2. On Tue, Oct 27, 2020 at 12:02 PM Henry Baker <hbaker1@pipeline.com> wrote:

Pick 2 random vectors in 4D.

What is the angle between them, in maximum likelihood ?

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