On Tuesday, February 5, 2013 6:03:08 AM UTC+13, Meran wrote: > Dear ALL > > > > > > I am trying to transform data from time domain which i have them in" txt" format to frequency domain by using " FFT ". The txt data has to columns ( 1st :Time) and (2nd :amplitude). I don't know , i need to use FFT(x) or FFT(x,n) and how can plot the data in have in time domain and plot in frequency Domain . > > > > > > Thanks for you Help .
You need to convert from 'txt' format (whatever that means) to numbers before you plot or use fft: help str2num