ex05220b.m

stft(含:短时傅立叶变换 Gabor变换等)

% Chapter 05: Example 5.22 Ploting of FFT execution times
%
load fft_time.mat;
top = ceil(max(fft_time));
%n = 1:2048;
subplot
clg
plot(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)')