On 11?15?, ??4?37?, "Nasser M. Abbasi" <n...@12000.org> wrote: > On 11/15/2012 2:33 AM, oversky wrote: > > > The mathwork fft example in the following link, > >http://bit.ly/SO9TuV > > why do we double abs(Y(1:NFFT/2+1) when plotting the amplitude? > > > plot(f,2*abs(Y(1:NFFT/2+1))) > > This was talked about before. can google it. Here is my take on it: > > "Why does it multiply by 2?" > > http://12000.org/my_notes/on_scaling_factor_for_ftt_in_matlab/index.htm > > --Nasser
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