Suppose the 9-vector x = (1, 1, 2, 3, 2, 1, 0, -1, 0) represents a time series. (a) We wish to calculate a new vector y equal to the cumulative sum of the elements of x, i.e., Find So. What are its dimensions? (b) Calculate y = S9x. X1 x1 + x₂ y = x₁ + x₂ + x3 = S9x. Σ₁=1 Xi

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