Compute the average of pwelch

Hi all

I have eeg signal with 129 samples,

I computed each signal, now I need to take the average of all 129 samples and plot that average. How can I do that?

Please help me.

I reeally appreciate that

clc;
close all;
clear;
load('eeg_Fs250Hz.mat');
[row columm] = size(eeg);
for i = 1:columm
    [ppx{i}, f{i}] = pwelch(eeg(:,i),200,100,200,Fs);

    figure(1);
    plot(ppx{i});
    hold on
end

Answer 1

[Tala]

not sure what the avarage of pwelch means! maybe avarage energy of your signal? there are better ways to do so...anyways...you could just this after your hold on command.

plot(mean(ppx{i}));

I would add f{i} as well in my plots. meaning plot(f{i}, ppx{i}) to see the frequencies on your plot

[Tu Nguyen]

That gave out just one value

[Tala]

The mean of an array is one value! Isn’t that what you wanted?

I am guessing you wanna use the mean like this. Subtracting the mean from the array

[ppx{i}, f{i}] = pwelch(eeg(:,i)-mean(eeg(:,i)),200,100,200,Fs);

[Tu Nguyen]

sorry for not clear of the question,

I mean there are 129 ppx, I want the average of each element of 129 ppx, and plot the average

[Tala]

use this after the loop

plot(mean(cell2mat(ppx)),':o')

[Tu Nguyen]

I got it. Appreciate you a lot

[Tala]

my pleasure