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: cfg_example_sum.m
    path of file: ./repos/ExploreASL/External/SPMmodified/matlabbatch/examples
    
    the code of the file until where you have to start completion: function sum = cfg_example_sum
% Example script that creates an cfg_exbranch to sum two numbers. The
% inputs are entered as vector, the output is just a single
% number. This function differs from cfg_example_add2 (except from names)
% only in the specification of input1.num.
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: cfg_example_sum.m 1716 2008-05-23 08:18:45Z volkmar $

rev = '$Rev: 1716 $'; %#ok

%% Input Item
input1         = cfg_entry; % This is the generic data entry item
input1.name    = 'Input a'; % The displayed name
input1.tag     = 'a';       % The name appearing in the harvested job structure. This name must be unique among all items in the val field of the superior node
input1.strtype = 'e';       % No restriction on what type of data is entered. This could be used to restrict input to real numbers, integers ...
input1.num     = [1 Inf];   % Number of inputs required (2D-array with exactly one row and two column)
input1.help    = {'This is the input vector.','The elements will be added together.'}; % help text displayed


    
function sum = cfg_example_sum
% Example script that creates an cfg_exbranch to sum two numbers. The
% inputs are entered as vector, the output is just a single
% number. This function differs from cfg_example_add2 (except from names)
% only in the specification of input1.num.
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: cfg_example_sum.m 1716 2008-05-23 08:18:45Z volkmar $

rev = '$Rev: 1716 $'; %#ok

%% Input Item
input1         = cfg_entry; % This is the generic data entry item
input1.name    = 'Input a'; % The displayed name
input1.tag     = 'a';       % The name appearing in the harvested job structure. This name must be unique among all items in the val field of the superior node
input1.strtype = 'e';       % No restriction on what type of data is entered. This could be used to restrict input to real numbers, integers ...
input1.num     = [1 Inf];   % Number of inputs required (2D-array with exactly one row and two column)
input1.help    = {'This is the input vector.','The elements will be added together.'}; % help text displayed

%% Executable Branch
sum      = cfg_exbranch;       % This is the branch that has information about how to run this module
sum.name = 'sum';             % The display name
sum.tag  = 'cfg_example_sum'; % The name appearing in the harvested job structure. This name must be unique among all items in the val field of the superior node
sum.val  = {input1};    % The items that belong to this branch. All items must be filled before this branch can run or produce virtual outputs
sum.prog = @cfg_example_run_sum;  % A function handle that will be called with the harvested job to run the computation
sum.vout = @cfg_example_vout_sum; % A function handle that will be called with the harvested job to determine virtual outputs
sum.help = {'Add two numbers.'};

%% Local Functions
% The cfg_example_vout_sum function can go here, it is not useful outside
% the batch environment.
function vout = cfg_example_vout_sum(job)
% Determine what outputs will be present if this job is run. In this case,
% the structure of the inputs is fixed, and the output is always a single
% number. Note that input items may not be numbers, they can also be
% depend