plot - Plotting 2D Hilbert Spectrum in MATLAB -


i want create 2d plot of hilbert spectrum. want time vs frequency plot, amplitude of signal represented color changes in plot.

what have done this, need this.

thank in advance

edit:

i have values of amplitude , instantaneous frequency on time, have produced using hilbert huang transform. let's use first imf, , have 100 samples. have is:

    instantaneous_frequency = [f1 f2 f3 ... f100]     instantaneous_amplitude = [a1 a2 a3 ... a100]     time = [t1 t2 t3 ... t100]

what need way plot them second image, without using spectrogram function, since uses stft , have applied hht.

the code producing first plot is:

time_window = 1:101; signal= rand(1,101); hilb = hilbert(signal); inst_amp = abs(hilb); inst_th = angle(hilb); inst_freq = diff(a_inst_th)/(1/256)/(2*pi); %instantaneous frequency  %inst_freq = remove_outliers(inst_freq,time_window(1:end-1));  inst_freq(end+1) = inst_freq(end); % done due diff() plot(time_window*4,inst_freq,'k.','markersize',5)

there matlab function produce spectrogram, looks lot want. see if solves problem.


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