help with homework for cs101?

Write and test the code for the function mysteryFunction that consumes a vector, V, and produces a new vector, W, of the same length where each element of W is the sum of the corresponding element in V and the previous element of V. Consider the previous element of V(1) to be 0. For example, mysteryFunction(1:8) should return [1 3 5 7 9 11 13 15] and mysteryFunction([1: 6].^ 2) should return [1 5 13 25 41 61]

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