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: test_tutorial_natmeg2014_preprocessing.m
    path of file: ./repos/fieldtrip/test
    
    the code of the file until where you have to start completion: function test_tutorial_natmeg2014_preprocessing

% WALLTIME 00:20:00
% MEM 4gb
% DEPENDENCY
% DATA public

% this script executes the MATLAB content from
% http://www.fieldtriptoolbox.org/tutorial/natmeg2014/timefrequency
%
% it corresponds to the wiki version of 7 October 2014

clear all
close all

cd(dccnpath('/home/common/matlab/fieldtrip/data/ftp/workshop/natmeg2014'));

cfg = [];
cfg.dataset    = 'oddball1_mc_downsampled.fif';
cfg.continuous = 'yes';
cfg.channel    = 'MEG*1';
cfg.viewmode   = 'vertical';
cfg.blocksize  = 1; % Length of data to display, in seconds
ft_databrowser(cfg);

cfg = [];
cfg.dataset = 'oddball1_mc_downsampled.fif';
cfg.channel = {'MEG*2', 'MEG*3'};
cfg.viewmode = 'vertical';
cfg.blocksize = 1;                             % Length of data to display, in seconds
ft_databrowser(cfg);

cfg = [];
cfg.dataset = 'oddball1_mc_downsampled.fif';
cfg.channel = 'EEG';
cfg.viewmode = 'vertical';
cfg.blocksize = 1;                             % Length of data to display, in seconds
cfg.preproc.demean = 'yes';                    % Demean the data before display
cfg.ylim = [-4e-6 4e-6];
ft_databrowser(cfg);

cfg = [];
cfg.dataset = 'oddball1_mc_downsampled.fif';

cfg.trialdef.prestim        = 1;
cfg.trialdef.poststim       = 1;

    
function test_tutorial_natmeg2014_preprocessing

% WALLTIME 00:20:00
% MEM 4gb
% DEPENDENCY
% DATA public

% this script executes the MATLAB content from
% http://www.fieldtriptoolbox.org/tutorial/natmeg2014/timefrequency
%
% it corresponds to the wiki version of 7 October 2014

clear all
close all

cd(dccnpath('/home/common/matlab/fieldtrip/data/ftp/workshop/natmeg2014'));

cfg = [];
cfg.dataset    = 'oddball1_mc_downsampled.fif';
cfg.continuous = 'yes';
cfg.channel    = 'MEG*1';
cfg.viewmode   = 'vertical';
cfg.blocksize  = 1; % Length of data to display, in seconds
ft_databrowser(cfg);

cfg = [];
cfg.dataset = 'oddball1_mc_downsampled.fif';
cfg.channel = {'MEG*2', 'MEG*3'};
cfg.viewmode = 'vertical';
cfg.blocksize = 1;                             % Length of data to display, in seconds
ft_databrowser(cfg);

cfg = [];
cfg.dataset = 'oddball1_mc_downsampled.fif';
cfg.channel = 'EEG';
cfg.viewmode = 'vertical';
cfg.blocksize = 1;                             % Length of data to display, in seconds
cfg.preproc.demean = 'yes';                    % Demean the data before display
cfg.ylim = [-4e-6 4e-6];
ft_databrowser(cfg);

cfg = [];
cfg.dataset = 'oddball1_mc_downsampled.fif';

cfg.trialdef.prestim        = 1;
cfg.trialdef.poststim       = 1;
cfg.trialdef.std_triggers   = 1;
cfg.trialdef.stim_triggers  = [1 2]; % 1 for standard, 2 for deviant
cfg.trialdef.odd_triggers   = 2;
cfg.trialdef.rsp_triggers   = [256 4096];
cfg.trialfun                = 'trialfun_oddball_stimlocked';
cfg                         = ft_definetrial(cfg);

cfg.continuous              = 'yes';
cfg.hpfilter                = 'no';
cfg.detrend