i need to plot the EEG in matlab.. i have downloaded the data base which is in .txt format. bt i am unable to plot it.. plz help

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x=load('F001.txt');
y=fft(x)
PS=abs(y).^2;
N=length(x);
fs=1000;
freq=(1:N/2)*fs/N;
plot(freq,PS)
this is not working,... an error is reported
Error using plot Vectors must be the same lengths.
Error in PLOT (line 7) plot(freq,PS)

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Azzi Abdelmalek
Azzi Abdelmalek le 2 Nov 2013
Look at freq=(1:N/2)*fs/N ,its length is different from PS length
  5 commentaires
Azzi Abdelmalek
Azzi Abdelmalek le 2 Nov 2013
Modifié(e) : Azzi Abdelmalek le 2 Nov 2013
x=load('F001.txt');
y=fft(x)
PS=abs(y).^2;
N=length(x);
fs=1000;
freq=(0:N-1)*fs/N;
plot(freq,PS)
If you want a symetric plot for frequencies: [-freq,freq]
freq=(0:ceil(N/2)-1)*fs/N;
PS=PS(1:numel(freq));
plot([-freq freq],[fliplr(PS) PS])

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