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: randomseed.m
    path of file: ./repos/spm12/external/fieldtrip/utilities/private
    
    the code of the file until where you have to start completion: function state = randomseed(setseed)

% RANDOMSEED retrieves or sets the random seed, taking into account the different
% MATLAB version specific methods
%
% Use as
%   state = randomseed(setseed)
%
% INPUT
% setseed    []              does not reset the state, but saves out the state for future use
%            integer         seed value to set to specifc state
%            state vector    state value (vector) output from previous call to setting the state
%
% OUTPUT
% state      vector of current state (or seed only)
%
% The output can be used as input re-create the same random number sequence


    
function state = randomseed(setseed)

% RANDOMSEED retrieves or sets the random seed, taking into account the different
% MATLAB version specific methods
%
% Use as
%   state = randomseed(setseed)
%
% INPUT
% setseed    []              does not reset the state, but saves out the state for future use
%            integer         seed value to set to specifc state
%            state vector    state value (vector) output from previous call to setting the state
%
% OUTPUT
% state      vector of current state (or seed only)
%
% The output can be used as input re-create the same random number sequence

% Copyright (C) 2011, Johanna Zumer
%
% 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/>.

if nargin<1
  setseed = [];
end