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_glm.m
    path of file: ./repos/spm12/toolbox/mixture
    
    the code of the file until where you have to start completion: function [rglm] = spm_glm (y,X,alpha,verbose)
% Fit a Bayesian GLM 
% FORMAT [rglm] = spm_glm (y,X,alpha,verbose)
%
% This function is called by spm_robust_glm if m==1
% 
% y          [N x 1] data vector
% X          [N x p] design matrix
% alpha      [1 x 1] weight precision (default=0.001)
% verbose    0/1 to printout inner workings (default=0)
%
% rglm       Returned model 

    
function [rglm] = spm_glm (y,X,alpha,verbose)
% Fit a Bayesian GLM 
% FORMAT [rglm] = spm_glm (y,X,alpha,verbose)
%
% This function is called by spm_robust_glm if m==1
% 
% y          [N x 1] data vector
% X          [N x p] design matrix
% alpha      [1 x 1] weight precision (default=0.001)
% verbose    0/1 to printout inner workings (default=0)
%
% rglm       Returned model 
%
% -------------------------------------------------------
% The fields in rglm are:
%
% m                The number of error components
% fm               The negative free energy
%
%                  In the field priors:
%
% b_0,c_0          Gamma parameters for precisions
%
%                  In the field posts:
%
% b,c              Gamma parameters for precisions
% w_mean           Mean estimated regression coefficients
% w_cov            Covariance of regression coefficients
%
%                  Mean posterior values:
% variances        variances (1./(b.*c))
%___________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Will Penny 
% $Id: spm_glm.m 1276 2008-03-28 18:29:19Z guillaume $

if nargin < 4 | isempty(verbose)
  verbose=0;
end