signal manually analysis matlab

f interest to analyse not specific values.

[Abderrahim. B]

Share more detilas.

Are you trying to extract a region of interest (ROI)t from EMG signal ? Do you know limits (end time and start time) of the ROI ?

Answer 1

[Abderrahim. B]

% Some dummy data
emg_signal = [-10*ones(4000,1)  ; -500*ones(8000,1);  -15*ones(6000,1) ] ;

% emcg_signal = 1rand()
figure
plot(emg_signal, "LineWidth", 2)

% ROI emg
roi_t = 4000:8000 ;
emg_roi = emg_signal(roi_t) ;

% Some spectral analysis of ROI emg
pspectrum(emg_roi)

[C S]

Thank you. But is there any other way to do it manually. For example, to use a funtion sumilar to ginput. In particular, one function that you allow you to select with your cursor the time of the signal that you want to analyze.

[Abderrahim. B]

Use input then . Copy, past and run this code in your MATLAB. input function will not run here (it is not supported).

clear ;
close all ;

% Some dummy data
emg_signal = [-10*ones(4000,1)  ; -500*ones(8000,1);  -15*ones(6000,1) ] ;

% emcg_signal = 1rand()
plot(emg_signal, "Color", 'k')
title("EMCG Signal")

% ROI emcg
roi_t = input("Enter ROI as row vector (e.g 4000:8000): ") ;
emg_roi = emg_signal(roi_t) ;

% Some spectral analysis of ROI emg
figure
pspectrum(emg_roi)
title("EMG ROI Spectrum ")