% Chapter 05: Example 5.22 Ploting of FFT execution times%load fft_time.mat;top = ceil(max(fft_time));%n = 1:2048;subplotclgplot(n,fft_time,'.');axis([0,2500,0,50])xlabel('N');ylabel('Time in Sec.')title('FFT execution times')text(2100,top,'o(N*N)')text(2100,top/2,'o(N*N/2)')text(2100,top/3,'o(N*N/3)')text(2100,top/4,'o(N*N/4)')text(2100,1,'o(N*logN)')