I think you should resample your time series uniformly, perhaps using Eval(x) as you do above. FFT algorithms such as Cooley-Turkey, if not all FFT algorithms, assume the discrete Fourier transform (DFT) has uniformly sampled time steps.
I think you should resample your time series uniformly, perhaps using Eval(x) as you do above. FFT algorithms such as Cooley-Turkey, if not all FFT algorithms, assume the discrete Fourier transform (DFT) has uniformly sampled time steps.