How to do fft to analysis RAW data from neurosky Mindwave ?

Hi, i have a problem on my script, i can't do a fft to analyze RAW data. this raw data i get by recording using my Neurosky Mindwave EEG device. after i record a brainwave, i save it as a workspace, to be analyze later. i use Matlab 2010a.

can anyone help me to solve this problem ?

when i run it, i got this error in command window :

x =

    89   133    36  -219    84    33    53    59    17    27   117    68    76   114    36    86   138    45    -5   138

??? Index exceeds matrix dimensions.

Error in ==> fftFIX at 7
plot(Fs*t(1:50))
 

this is the script that i use :

Fs = 1000;                    % Sampling frequency
T = 1/Fs;                     % Sample time
L = length(data_RAW);         % Length of signal
t = (0:L-1)*T;                % Time vector
% Sum of a 50 Hz sinusoid and a 120 Hz sinusoid
x = data_RAW 
plot(Fs*t(1:50))
title('RAW Brainwave Signal')
xlabel('Time (seconds)')

NFFT = nextpow2(L); % Next power of 2 from length of y
Y = fft(NFFT)/L;
f = Fs/2*linspace(0,1,NFFT/2+1);

% Plot single-sided amplitude spectrum.
plot(f,2*abs(Y(1:NFFT/2+1))) 
title('Single-Sided Amplitude Spectrum of y(t)')
xlabel('Frequency (Hz)')
ylabel('|Y(f)|')

[Bambang Handoko]

data_RAW is the variable that i use from workspace that i save before

[ali hussein]

i have the same question, i want to use FFT for convert the Neurosky EEG raw data because i want to use it in control a drone. it is is easy for using in freq domain..... but i use processing to write the code

[Sajitha S]

I am using Neurosky EEG ,How can i know store the raw data into my dataset plase can you help me.