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matlab code for spetrogram of a signal

I need to plot the spectrogram of the following signal :

Fs = 1000; % Sampling frequency

T = 1/Fs; % Sampling period

L = 1000; % Length of signal

t = (0:L-1)*T; % Time vector

S1 = 1.7*cos(2*pi*10*t) + 2*cos(2*pi*20*t)+ 7*cos(2*pi*30*t) + 3*cos(2*pi*40*t)+0.7*cos(2*pi*50*t) + cos(2*pi*60*t)+ 4.7*cos(2*pi*70*t) + 8*cos(2*pi*80*t)+9.7*cos(2*pi*90*t) + 10*cos(2*pi*100*t)+ 17*cos(2*pi*105*t) + 0.5*cos(2*pi*110*t);

Thanks.

Compétences : Matlab and Mathematica

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