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function fftx(s,T)
M=size(s);
N=M(1);
t=linspace(T/N,T,N);
dt=t(2)-t(1);
f=1/dt;
X=fft(s);
if mod(N,2)==0
   F=X(1:N/2);
   F=F*2/N;
   f=f*(0:N/2-1)/N;
   plot(f,abs(F),'-k');
else
    F=X(1N-1)/2);
    F=F*2/N;
    f=f*(0N-1)/2-1)/(N-1);
    plot(f,abs(F),'-k');
end


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