Plot a Histogram of the Amplitudes of various frequencies of a Signal

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Riyasat 2015-11-15

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https://ww2.mathworks.cn/matlabcentral/answers/254967-plot-a-histogram-of-the-amplitudes-of-various-frequencies-of-a-signal

评论： Adam Danz 2021-8-18

Hello, I need to plot a bar Histogram of a signal after performing a fft. It is an ENF data, so most amplitudes should be around 60Hz region and around within +/-0.5 Hz. I want an output like the figure I attached. The signal 'x' has length L=10000

code:

    x = x(1:1000,1);
    T = 1/fs;
    L=length(x);
    t = (0:L-1)*T;
    Y = fft(x);
    P2 = abs(Y/L);
    P1 = P2(1:L/2+1);
    P1(2:end-1) = 2*P1(2:end-1);
    f = fs*(0:(L/2))/L;
    plot(f,P1)
    title('Single-Sided Amplitude Spectrum of X(t)')
    xlabel('f (Hz)')