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: parameterselection.m
    path of file: ./repos/fieldtrip/contrib/nutmegtrip/private
    
    the code of the file until where you have to start completion: function [select] = parameterselection(param, data)

% PARAMETERSELECTION selects the parameters that are present as a volume in the data
% add that have a dimension that is compatible with the specified dimensions of the
% volume, i.e. either as a vector or as a 3D volume.
%
% Use as

    
function [select] = parameterselection(param, data)

% PARAMETERSELECTION selects the parameters that are present as a volume in the data
% add that have a dimension that is compatible with the specified dimensions of the
% volume, i.e. either as a vector or as a 3D volume.
%
% Use as
%   [select] = parameterselection(param, data)
% where
%   param    cell-array, or single string, can be 'all'
%   data     structure with anatomical or functional data
%   select   returns the selected parameters as a cell-array

% Copyright (C) 2005-2008, 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/>.
%
% $Id$

if ischar(param)
  param = {param};   % it should be a cell-array
elseif isempty(param)
  param = {};        % even being empty, it should be a cell-array
end