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_dcm_connectivity_ui.m
    path of file: ./repos/spm12
    
    the code of the file until where you have to start completion: function con = spm_dcm_connectivity_ui(DCM,D,title_text,defaults,enabled)

    
function con = spm_dcm_connectivity_ui(DCM,D,title_text,defaults,enabled)
% GUI for manually specifying connection values in a DCM
% FORMAT [con] = spm_dcm_connectivity_ui(DCM,D,title_text,defaults,enabled)
%
% DCM        - DCM structure
% D          - 'A','B' or 'C' i.e. connectivity matrix of interest
% title_text - Text to display above the matrix, e.g. 'Enter contrast for '
% defaults   - (optional) structure of default values containing
%              defaults.A, defaults.B and defaults.C
% enabled    - (optional) structure of inputs to enable with binary 
%              matrices enabled.A, enabled.B and enabled.C
% 
% Returns:
% con        - structure with con.A, con.B and con.C of user-entered values
%__________________________________________________________________________
% Copyright (C) 2014-2016 Wellcome Trust Centre for Neuroimaging    

% Will Penny & Peter Zeidman
% $Id: spm_dcm_connectivity_ui.m 6808 2016-06-13 16:48:30Z guillaume $


% Set-up data
%--------------------------------------------------------------------------
n       = DCM.n;              % number of regions
m       = length(DCM.U.name); % number of inputs

region_names = DCM.Y.name;
input_names  = DCM.U.name;

try, A = defaults.A; catch, A = zeros(n,n); end