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_phase.m
    path of file: ./repos/spm/toolbox/dcm_meeg
    
    the code of the file until where you have to start completion: function DCM = spm_dcm_phase(DCM)   
% Estimate parameters of a DCM model of phase-coupled responses
% FORMAT DCM = spm_dcm_phase(DCM)   
%
% DCM     
%    name: name string
%       M:  Forward model
%              M.dipfit - leadfield specification
%       xY: data   [1x1 struct]
%       xU: design [1x1 struct]
%
%   Sname: cell of source name strings
%
%   Connection constraints:

    
function DCM = spm_dcm_phase(DCM)   
% Estimate parameters of a DCM model of phase-coupled responses
% FORMAT DCM = spm_dcm_phase(DCM)   
%
% DCM     
%    name: name string
%       M:  Forward model
%              M.dipfit - leadfield specification
%       xY: data   [1x1 struct]
%       xU: design [1x1 struct]
%
%   Sname: cell of source name strings
%
%   Connection constraints:
%
%       A: {[nr x nr double] }
%       B: {[nr x nr double]}   for GUI specification
%                               (Nfourier=1 & only sine terms)
%   or
%
%       As: [nr x nr x Nfourier]
%       Ac: [nr x nr x Nfourier]
%       Bs: [nr x nr x Nfourier]   
%       Bc: [nr x nr x Nfourier]   for script specification
%
%   options.type         - 'ECD' 
%__________________________________________________________________________

% Will Penny
% Copyright (C) 2005-2022 Wellcome Centre for Human Neuroimaging


% check options 
%==========================================================================
clear spm_erp_L

% Filename and options
%--------------------------------------------------------------------------
try, DCM.name;                  catch, DCM.name           = 'DCM_PHASE'; end