You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: spm_csd_fmri_gu.m
    path of file: ./repos/bspm/thirdparty/spm12
    
    the code of the file until where you have to start completion: function [Gu,Gn,w, dt] = spm_csd_fmri_gu(P,dt)
% spectra of neuronal fluctuations and noise
% FORMAT [Gu,Gn,Hz,dt] = spm_csd_fmri_gu(P,dt)
%
% P  - model parameters
% dt - sampling interval
%
% This routine returns the spectra of neuronal fluctuations and noise for a
% standard frequency range specified by the sampling interval
%
%__________________________________________________________________________

    
function [Gu,Gn,w, dt] = spm_csd_fmri_gu(P,dt)
% spectra of neuronal fluctuations and noise
% FORMAT [Gu,Gn,Hz,dt] = spm_csd_fmri_gu(P,dt)
%
% P  - model parameters
% dt - sampling interval
%
% This routine returns the spectra of neuronal fluctuations and noise for a
% standard frequency range specified by the sampling interval
%
%__________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Karl Friston
% $Id: spm_csd_fmri_gu.m 6759 2016-03-27 19:45:17Z karl $


% compute log-spectral density
%==========================================================================

% frequencies of interest
%--------------------------------------------------------------------------
Hz1  = 1/128;
Hz2  = 1/(2*dt);
nw   = 32;
w    = linspace(Hz1,Hz2,nw)';

% number of nodes and end