Date: Apr 4, 2013 12:46 PM
Author: fl
Subject: Why does the default fft data number change for a identification data
Hi,

I try to run a snippnet of identification toolbox user guide:

% Load input u2 and output y2

load dryer2;

% Create iddata object

tdata = iddata(y2,u2,0.08);

% Take the Fourier transform of the data

% transforming it to frequency domain

fdata = fft(tdata)

% Get property values of data

get(fdata)

The length of tdata is 1000 while the length of fdata is 501. I have check function fft and I do not find anything can explain it to me. Could you help me on this question?

Thanks,