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_DEM_MEG.m
    path of file: ./repos/spm/toolbox/DEM
    
    the code of the file until where you have to start completion: function [R] = spm_DEM_MEG(DEM,dt,n,graphics)
% as for spm_DEM_EEG but plots the causal and hidden errors
% FORMAT [R] = spm_DEM_MEG(DEM,dt,n,graphics)
% DEM  - DEM structure
% dt   - time bin (seconds)
% n    - level[s]
% g    - graphics switch
%
% R{i} - response over peri-stimulus time (whitened error): level i
%
% These simulated response assume that LFPs are generated by superficial

    
function [R] = spm_DEM_MEG(DEM,dt,n,graphics)
% as for spm_DEM_EEG but plots the causal and hidden errors
% FORMAT [R] = spm_DEM_MEG(DEM,dt,n,graphics)
% DEM  - DEM structure
% dt   - time bin (seconds)
% n    - level[s]
% g    - graphics switch
%
% R{i} - response over peri-stimulus time (whitened error): level i
%
% These simulated response assume that LFPs are generated by superficial
% pyramidal cells that correspond to units encoding precision-weighted
% prediction error.
%
% see also spm_DEM_ERP
%__________________________________________________________________________

% Karl Friston
% Copyright (C) 2008-2022 Wellcome Centre for Human Neuroimaging

% defaults
%--------------------------------------------------------------------------
if ~nargout; graphics = 1; end