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_chf.m
    path of file: ./repos/bspm/thirdparty/spm12/toolbox/dcm_meeg
    
    the code of the file until where you have to start completion: function [m,v] = spm_csd_chf(P,M,U)

    
function [m,v] = spm_csd_chf(P,M,U)
% Characteristic (expected) frequency of a NMM
% FORMAT [G,w] = spm_csd_chf(P,M,U)
%
% P - parameters
% M - neural mass model structure
% U - trial-specific effects
%
% m - expected frequency
% v - dispersion
%__________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging
 
% Karl Friston
% $Id: spm_csd_chf.m 4718 2012-04-19 15:34:45Z karl $
 
 
% compute log-spectral density (without noise)
%==========================================================================
P.a(1) = -0;
P.a(2) = -32;
P.b    = P.b - 32;
P.c    = P.c - 32;
 
[G,w]  = spm_csd_mtf(P,M,U);
 
% compute moments (treating abs(G{i}) as a density)
%--------------------------------------------------------------------------
for i = 1:length(G)
    p     = abs(G{i});
    p     = p/sum(p);
    m(i)  = w'*p;
    v(i)  = ((w - m(i)).^2)'*p;
end