Question: What is 2*abs(fft) such as in plot in the code below? _MATLAB code NFFT = 2^nextpow2(L); % Next power of 2 from length of y

What is 2*abs(fft) such as in plot in the code below? 
_MATLAB code NFFT = 2^nextpow2(L); % Next power of 2 from length of y Y = fft(y,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)|')

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