这个MATLAB程序运行出来以后没有图像,是什么原因呢?fs=200;deltaf=1;T=1/fs

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这个程序才是真正解决了,哈哈!fs=200;
deltaf=1;
T=1/fsL=1/deltafN=floor(fs/deltaf)+1;
t=0:0.005:1;
freq=0:deltaf:fsf_t=sin(2*pi*500*t)+0.6*sin(2*pi*800*t)f_t_rectwin=f_t.*rectwin(201)'f_t_hann=f_t.*hann(201)';f_t_hamming=f_t.*hamming(201)';F_w_rectwin=T*fft(f_t_rectwin,N)F_w_hann=T*fft(f_t_hann,N)F_w_hamming=T*fft(f_t_hamming);subplot(3,1,1);semilogy(freq,1e14*abs(F_w_rectwin));title('rectwin windowing spectrum');
%axis([0,200,1e-14,1]);grid on;subplot(3,1,2);semilogy(freq,abs(F_w_hann));
title('hann windowing spectrum');
%axis([0,200,1e-4,1]);grid on;subplot(3,1,3);semilogy(freq,abs(F_w