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: hasyokogawa.m
    path of file: ./repos/CBIG/external_packages/matlab/default_packages/cifti-matlab/private
    
    the code of the file until where you have to start completion: function [version] = hasyokogawa(desired)

% HASYOKOGAWA tests whether the data input toolbox for MEG systems by

    
function [version] = hasyokogawa(desired)

% HASYOKOGAWA tests whether the data input toolbox for MEG systems by
% Yokogawa (www.yokogawa.com, designed by KIT/EagleTechnology) is
% installed. Only the newest version of the toolbox is accepted.
%
% Use as
%   string  = hasyokogawa;
% which returns a string describing the toolbox version, e.g. "12bitBeta3",
% "16bitBeta3", or "16bitBeta6" for preliminary versions, or '1.4' for the
% official Yokogawa MEG Reader Toolbox. An empty string is returned if the toolbox
% is not installed. The string "unknown" is returned if it is installed but
% the version is unknown.
%
% Alternatively you can use it as
%   [boolean] = hasyokogawa(desired);
% where desired is a string with the desired version.
%
% See also READ_YOKOGAWA_HEADER, READ_YOKOGAWA_DATA, READ_YOKOGAWA_EVENT,
% YOKOGAWA2GRAD

% Copyright (C) 2010, Tilmann Sander-Thoemmes
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% 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/>.
%
% $Id$

ws = warning('off', 'MATLAB:pfileOlderThanMfile');

% there are a few versions of the old preliminary implementation, such as
% 12bitBeta3, 16bitBeta3 and 16bitBeta6. In 2011 a completely new
% implementation was officially released, which contains functions with
% other names. At the time of writing this, the new implementation is
% version 1.4.

if exist('getYkgwVersion')
  res = getYkgwVersion();
  version = res.version;

elseif exist('GetMeg160ADbitInfoM') || exist('GetMeg160ChannelInfoM') || exist('GetMeg160ContinuousRawDataM')
  % start with unknown, try to refine the version
  version = 'unknown';

  try
    % Call some functions with input argument "Inf": If
    % the functions are present they return their revision number.
    % Call first GetMeg160ADbitInfoM as this is not present in
    % the 12bit library, in case of error the "catch" part will take over.
    % The code below is intentionally very literal for easy of reading.
    res = textscan(evalc('GetMeg160ADbitInfoM(Inf);'),'%s %s %c %s %s %d');
    rev_ADbitInfoM = res{6};
    res = textscan(evalc('GetMeg160ChannelInfoM(Inf);'),'%s %s %c %s %s %d');
    rev_ChannelInfoM = res{6};
    res = textscan(evalc('GetMeg160AmpGainM(Inf);'),'%s %s %c %s %s %d');
    rev_AmpGainM = res{6};
    res = textscan(evalc('GetMeg160MatchingInfoM(Inf);'),'%s %s %c %s %s %d');
    rev_MatchingInfoM = res{6};
    if [0 2 1 5] == [rev_ADbitInfoM rev_ChannelInfoM rev_AmpGainM rev_MatchingInfoM]
      version='16bitBeta3';
    elseif [0 2 2 5] == [rev_ADbitInfoM rev_ChannelInfoM rev_AmpGainM rev_MatchingInfoM]
      version='16bitBeta6';
    else
      warning('The version of the installed Yokogawa toolbox cannot be determined.');
    end