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_lambda.m
    path of file: ./repos/bspm/thirdparty/spm8
    
    the code of the file until where you have to start completion: function [block] = spm_vb_lambda (Y,block)
% Variational Bayes for GLM-AR models - Update lambda
% FORMAT [block] = spm_vb_lambda (Y,block)
%
% Y             [T x N] time series 

    
function [block] = spm_vb_lambda (Y,block)
% Variational Bayes for GLM-AR models - Update lambda
% FORMAT [block] = spm_vb_lambda (Y,block)
%
% Y             [T x N] time series 
% block         data structure containing the following fields:
%___________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Will Penny and Nelson Trujillo-Barreto
% $Id: spm_vb_lambda.m 2451 2008-11-10 16:20:32Z lee $

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