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_nvc_specify.m
    path of file: ./repos/spm/toolbox/NVC
    
    the code of the file until where you have to start completion: function DCM = spm_dcm_nvc_specify(SPM,xY_fMRI,MEEG,model,n_exclude,fmri_cond,options)
% Specify unestimated structure for (multimodal) DCM for fMRI and M/EEG
% FORMAT DCM = spm_dcm_nvc_specify(SPM,xY_fMRI, MEEG, Model,N_exclude,fmri_cond,options)
%
% See spm_dcm_nvc.m for detailed descriptions of the parameters
%

    
function DCM = spm_dcm_nvc_specify(SPM,xY_fMRI,MEEG,model,n_exclude,fmri_cond,options)
% Specify unestimated structure for (multimodal) DCM for fMRI and M/EEG
% FORMAT DCM = spm_dcm_nvc_specify(SPM,xY_fMRI, MEEG, Model,N_exclude,fmri_cond,options)
%
% See spm_dcm_nvc.m for detailed descriptions of the parameters
%
% Inputs:
% -------------------------------------------------------------------------
% SPM          -  SPM structure or location of SPM.mat
% xY_fMRI      -  Cell array of VOI filenames (the same order as sources in EEG DCM)
% MEEG         -  Location of DCM for M/EEG .mat file or DCM structure
% model        -  Model space definition (see spm_dcm_nvc.m)
% n_exclude    -  Which neuronal populations should drive haemodynamics (optional)
% fmri_cond    -  Which fMRI conditions to include (optional)
% options      -  DCM options
%
% Evaluates:
% -------------------------------------------------------------------------
%
% DCM          -  unestimated DCM
%__________________________________________________________________________
% Jafarian, A., Litvak, V., Cagnan, H., Friston, K.J. and Zeidman, P., 2019.
% Neurovascular coupling: insights from multi-modal dynamic causal modelling
% of fMRI and MEG. arXiv preprint arXiv:1903.07478.
%__________________________________________________________________________

% Amirhossein Jafarian
% Copyright (C) 2019-2022 Wellcome Centre for Human Neuroimaging


%-Get SPM file and DCM for MEG
%--------------------------------------------------------------------------
if ischar(SPM)
    swd = spm_file(SPM);
    try
        load(fullfile(swd,'SPM.mat'))
    catch
        error('Cannot read %s.',fullfile(swd,'SPM.mat'));
    end