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_datatype_mvar.m
    path of file: ./repos/spm12/external/fieldtrip/fileio/private
    
    the code of the file until where you have to start completion: function [mvar] = ft_datatype_mvar(mvar, varargin)

% FT_DATATYPE_MVAR describes the FieldTrip MATLAB structure for multi-variate
% autoregressive model data.
%
% The mvar datatype represents multivariate model estimates in the time- or
% in the frequency-domain. This is usually obtained from FT_MVARANALYSIS,
% optionally in combination with FT_FREQANALYSIS.
%
% The following is an example of sensor level MVAR model data in the time domain
%
%        dimord: 'chan_chan_lag'     defines how the numeric data should be interpreted
%         label: {3x1 cell}          the channel labels
%        coeffs: [3x3x5 double]      numeric data (MVAR model coefficients 3 channels x 3 channels x 5 time lags)
%      noisecov: [3x3 double]        more numeric data (covariance matrix of the noise residuals 3 channels x 3 channels)
%           dof: 500
%   fsampleorig: 200
%           cfg: [1x1 struct]
%
% The following is an example of sensor-level MVAR model data in the frequency domain
%
%        dimord: 'chan_chan_freq'    defines how the numeric data should be interpreted
%         label: {3x1 cell}          the channel labels
%          freq: [1x101 double]      the frequencies, expressed in Hz
%      transfer: [3x3x101 double]
%     itransfer: [3x3x101 double]
%      noisecov: [3x3 double]
%     crsspctrm: [3x3x101 double]
%           dof: 500
%           cfg: [1x1 struct]
%

    
function [mvar] = ft_datatype_mvar(mvar, varargin)

% FT_DATATYPE_MVAR describes the FieldTrip MATLAB structure for multi-variate
% autoregressive model data.
%
% The mvar datatype represents multivariate model estimates in the time- or
% in the frequency-domain. This is usually obtained from FT_MVARANALYSIS,
% optionally in combination with FT_FREQANALYSIS.
%
% The following is an example of sensor level MVAR model data in the time domain
%
%        dimord: 'chan_chan_lag'     defines how the numeric data should be interpreted
%         label: {3x1 cell}          the channel labels
%        coeffs: [3x3x5 double]      numeric data (MVAR model coefficients 3 channels x 3 channels x 5 time lags)
%      noisecov: [3x3 double]        more numeric data (covariance matrix of the noise residuals 3 channels x 3 channels)
%           dof: 500
%   fsampleorig: 200
%           cfg: [1x1 struct]
%
% The following is an example of sensor-level MVAR model data in the frequency domain
%
%        dimord: 'chan_chan_freq'    defines how the numeric data should be interpreted
%         label: {3x1 cell}          the channel labels
%          freq: [1x101 double]      the frequencies, expressed in Hz
%      transfer: [3x3x101 double]
%     itransfer: [3x3x101 double]
%      noisecov: [3x3 double]
%     crsspctrm: [3x3x101 double]
%           dof: 500
%           cfg: [1x1 struct]
%
% Required fields:
%   - label, dimord, freq
%
% Optional fields:
%   - too many to mention
%
% Deprecated fields:
%   - <none>
%
% Obsoleted fields:
%   - <none>
%
% Revision history:
%
% (2011/latest) The description of the sensors has changed, see FT_DATATYPE_SENS
% for further information.
%
% (2008) The initial version was defined.
%
% See also FT_DATATYPE, FT_DATATYPE_COMP, FT_DATATYPE_DIP, FT_DATATYPE_FREQ,
% FT_DATATYPE_MVAR, FT_DATATYPE_RAW, FT_DATATYPE_SOURCE, FT_DATATYPE_SPIKE,
% FT_DATATYPE_TIMELOCK, FT_DATATYPE_VOLUME

% Copyright (C) 2011, Robert Oostenveld
%
% 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/>.
%
% $Id$

% get the optional input arguments, which should be specified as key-value pairs
version = ft_getopt(varargin, 'version', 'latest');

if strcmp(version, 'latest')
  version = '2011';
end