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_mci_minit.m
    path of file: ./repos/spm/toolbox/mci/inference
    
    the code of the file until where you have to start completion: function [M] = spm_mci_minit (M)
% Check and initialise model strucuture
% FORMAT [M] = spm_mci_minit (M)

    
function [M] = spm_mci_minit (M)
% Check and initialise model strucuture
% FORMAT [M] = spm_mci_minit (M)
%
% eg. Pre-compute quantities for computing log-joint
%__________________________________________________________________________

% Will Penny
% Copyright (C) 2015 Wellcome Trust Centre for Neuroimaging

if isstruct(M.pE)
    M.vpE=spm_vec(M.pE);
else
    M.vpE=M.pE;
end