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    %% Return Only Full-Window Averages
% Compute the three-point centered moving average of a row vector, but discard
% any calculation that uses fewer than three points from the output.  In
% other words, return only the averages computed from a full three-element
% window, discarding endpoint calculations.

A = [4 8 6 -1 -2 -3 -1 3 4 5];
M = movmean(A,3,'Endpoints','discard')