FOURIER is the jSpectral module of jLab.

 FOURIER  The one-sided Fourier frequencies for a given length time series.
    F=FOURIER(N) returns the one-sided (or positive) Fourier frequencies 
    for a time series of length N.   
    F is a radian or angular frequency so that the Nyquist is at PI.
    F=FOURIER(DT,N) uses sample rate DT in calculating the frequencies, so
    that the Nyquist will be at PI/DT.
    Note that the highest resolved frequency, MAX(F), differs for even or
    odd N.  For even N, it is the Nyquist PI/DT, but for odd N the Nyquist
    is not resolved and the highest resolved frequency is (N-1)/N * PI/DT.
    F has length FLOOR(N/2)+1, or N/2+1 for even N, and (N+1)/2 for odd N.
    Usage: f=fourier(N);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2011--2014 J.M. Lilly --- type 'help jlab_license' for details

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