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_vb_F.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8
    
    the code of the file until where you have to start completion: function [F,Lav,KL] = spm_vb_F (Y,block)
% Compute lower bound on evidence, F, for VB-GLM-AR models
% FORMAT [F,Lav,KL] = spm_vb_F (Y,block)
%
% Y             [T x N] time series 
% block         data structure containing the following fields:
%
% F             Lower bound on model evidence, F
% Lav           Average Likelihood
% KL            Kullback-Liebler Divergences with fields
%               .w, .alpha, .beta, .Lambda, .a
%
% This function implements equation 18 in paper VB4
%___________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging


    
function [F,Lav,KL] = spm_vb_F (Y,block)
% Compute lower bound on evidence, F, for VB-GLM-AR models
% FORMAT [F,Lav,KL] = spm_vb_F (Y,block)
%
% Y             [T x N] time series 
% block         data structure containing the following fields:
%
% F             Lower bound on model evidence, F
% Lav           Average Likelihood
% KL            Kullback-Liebler Divergences with fields
%               .w, .alpha, .beta, .Lambda, .a
%
% This function implements equation 18 in paper VB4
%___________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Will Penny 
% $Id: spm_vb_F.m 2451 2008-11-10 16:20:32Z lee $

if block.verbose
    disp('Updating F');
end