help movmean
Y = movmean(X,K) for a vector X and positive integer scalar K computes
a centered moving average by sliding a window of length K along X. Each
element of Y is the local mean of the corresponding values of X inside
the window, with Y the same size as X. When K is even, the window is
centered about the current and previous elements of X. The sliding
window is truncated at the endpoints where there are fewer than K
elements from X to fill the window.
So it does not take the first 5 and then move over 5 and take those and so on:
[mean(x(1:3))
mean(x(1:4))
mean(x(1:5))
mean(x(2:6))
mean(x(3:7))
....
]
and ending at x(end-2:end)
