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    %% Trailing Moving Sum of Vector
% Compute the three-point trailing moving sum of a row vector.  When there
% are fewer than three elements in the window at the endpoints, |movsum|
% takes the sum over the number of elements that are available.

A = [4 8 6 -1 -2 -3 -1 3 4 5];
M = movsum(A,[2 0])