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    %% Centered Moving Standard Deviation of Vector
% Compute the three-point centered moving standard deviation of a row
% vector.  When there are fewer than three elements in the window at the
% endpoints, take the standard deviation over the elements that
% are available.

A = [4 8 6 -1 -2 -3 -1 3 4 5];
M = movstd(A,3)