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?