Write two Matlab scripts that will calculate the following sum: y = sigma_k cos(3 pi k)e^-2[k] where the integer k starts at -20 and ends at 20, but skips over k = -3 and k = 3. Note that the Matlab command that implements the exponential is exp, so that e^2 is calculated as exp(2). In the first script (name this mysumfor), implement the calculation using a for loop and if statements. In the second script (name this mysumvec) use vectorization and the Matlab command sum. You may also find the line k = [-20: -4 -2: 2, 4: 20] useful (try it and see what happens). Hand in your m-file scripts