Using the tic and toc functions we will investigate trends in the computation times for the direct computation of the DFT. Write a MATLAB script that computes and plots computation times for the dftdirect function for N = 2 where 2 10. For this purpose generate an N-point complex-valued signal as x = randn(1,N) + 1j*randn(1,N). Describe the resulting trend in the computational complexity of the direct DFT computations