please use matlab

PROBLEM 6 (10 points): Roberts 3.39 (1) Find the signal energy mathematically of y[n], (2) then use MATLAB, similar to example 3.2 in text using cumsum, to verify your result. (no graph is needed, ust the code and resulting answer matching the signal energy) y[n] = x[2n] Where (pay attention to limits of n!): 0 otherwise