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_cfg_eeg_inv_patchdef.m
    path of file: ./repos/ExploreASL/External/SPMmodified/config
    
    the code of the file until where you have to start completion: function inv_patchdef = spm_cfg_eeg_inv_patchdef
% Configuration file for taking a number of previous inversion results (maybe based on different data), smoothing and creating an approximate posterior
%
%__________________________________________________________________________
% Copyright (C) 2010 Wellcome Trust Centre for Neuroimaging

% Gareth Barnes
% $Id: spm_cfg_eeg_inv_patchdef.m 5927 2014-03-26 16:02:56Z gareth $

D = cfg_files;
D.tag = 'D';
D.name = 'Prior patch density file';

    
function inv_patchdef = spm_cfg_eeg_inv_patchdef
% Configuration file for taking a number of previous inversion results (maybe based on different data), smoothing and creating an approximate posterior
%
%__________________________________________________________________________
% Copyright (C) 2010 Wellcome Trust Centre for Neuroimaging

% Gareth Barnes
% $Id: spm_cfg_eeg_inv_patchdef.m 5927 2014-03-26 16:02:56Z gareth $

D = cfg_files;
D.tag = 'D';
D.name = 'Prior patch density file';
D.filter = 'gii';
D.num = [1 Inf];
D.help = {'Select the prior patch distribution file'};



npatch = cfg_entry;
npatch.tag = 'npatch';
npatch.name = 'Number of patches';
npatch.strtype = 'n';
npatch.help = {'Total number of patches'};
npatch.val = {512};

niter = cfg_entry;
niter.tag = 'niter';
niter.name = 'Number of iterations';
niter.strtype = 'n';
niter.help = {'Total number of random patch sets'};
niter.val = {32};



inv_patchdef = cfg_exbranch;
inv_patchdef.tag = 'inv_patchdef';
inv_patchdef.name = 'Set prior sampling';
inv_patchdef.val = {D,npatch,niter};
inv_patchdef.help = {'Use to make up a patch definition file'};
inv_patchdef.prog = @run_inv_patchdef;
inv_patchdef.vout = @vout_inv_patchdef;
inv_patchdef.modality = {'MEG'};

function  out = run_inv_patchdef(job)


inverse = [];
if numel(job.D)<1,
    error('Need to add a number of files to combine');
end