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: ft_preamble.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/external/fieldtrip/utilities
    
    the code of the file until where you have to start completion: function ft_preamble(cmd, varargin)

% FT_PREAMBLE is a helper function that is included in many of the FieldTrip
% functions and which takes care of some general settings and operations at the
% begin of the function.
%
% This ft_preamble m-file is a function, but internally it executes a
% number of private scripts in the callers workspace. This allows the
% private script to access the variables in the callers workspace and
% behave as if the script were included as a header file in C-code.
%
% See also FT_POSTAMBLE

% Copyright (C) 2011-2012, Robert Oostenveld, DCCN
%
% This file is part of FieldTrip, see http://www.ru.nl/neuroimaging/fieldtrip
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation, either version 3 of the License, or
%    (at your option) any later version.

    
function ft_preamble(cmd, varargin)

% FT_PREAMBLE is a helper function that is included in many of the FieldTrip
% functions and which takes care of some general settings and operations at the
% begin of the function.
%
% This ft_preamble m-file is a function, but internally it executes a
% number of private scripts in the callers workspace. This allows the
% private script to access the variables in the callers workspace and
% behave as if the script were included as a header file in C-code.
%
% See also FT_POSTAMBLE

% Copyright (C) 2011-2012, Robert Oostenveld, DCCN
%
% This file is part of FieldTrip, see http://www.ru.nl/neuroimaging/fieldtrip
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation, either version 3 of the License, or
%    (at your option) any later version.
%
%    FieldTrip is distributed in the hope that it will be useful,
%    but WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%    GNU General Public License for more details.
%
%    You should have received a copy of the GNU General Public License
%    along with FieldTrip. If not, see <http://www.gnu.org/licenses/>.
%
% $Id: ft_preamble.m 7200 2012-12-15 15:56:55Z roboos $

% ideally this would be a script, because the local variables would then be
% shared with the calling function. Instead, this is a function which then
% passes the variables explicitely to another script which is eval'ed.

% the following section ensures that these scripts are included as
% dependencies when using the MATLAB compiler
%
%#function ft_preamble_help
%#function ft_preamble_debug
%#function ft_preamble_trackconfig
%#function ft_preamble_provenance
%#function ft_preamble_loadvar
%#function ft_preamble_randomseed

global ft_default

% this is a trick to pass the input arguments into the ft_preamble_xxx script
ft_default.preamble = varargin;

if exist(['ft_preamble_' cmd], 'file')
  evalin('caller', ['ft_preamble_' cmd]);
end

if isfield(ft_default, 'preamble')
  % the preamble field should not remain in the ft_default structure
  ft_default = rmfield(ft_default, 'preamble');
end