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: set.m
    path of file: ./repos/CBIG/external_packages/matlab/non_default_packages/cifti-matlab-WashU-gradient/@xmltree
    
    the code of the file until where you have to start completion: function tree = set(tree,uid, parameter, value)
% XMLTREE/SET Method (set object properties)
% FORMAT tree = set(tree,uid,parameter,value)
% 
% tree      - XMLTree object
% uid       - array (or cell) of uid's
% parameter - property name
% value     - property value
%__________________________________________________________________________
%
% Set object properties given its uid and pairs parameter/value
% The tree parameter must be in input AND in output
%__________________________________________________________________________
% Copyright (C) 2002-2011  http://www.artefact.tk/

    
function tree = set(tree,uid, parameter, value)
% XMLTREE/SET Method (set object properties)
% FORMAT tree = set(tree,uid,parameter,value)
% 
% tree      - XMLTree object
% uid       - array (or cell) of uid's
% parameter - property name
% value     - property value
%__________________________________________________________________________
%
% Set object properties given its uid and pairs parameter/value
% The tree parameter must be in input AND in output
%__________________________________________________________________________
% Copyright (C) 2002-2011  http://www.artefact.tk/

% Guillaume Flandin
% $Id: set.m 4460 2011-09-05 14:52:16Z guillaume $


%error(nargchk(4,4,nargin));

if iscell(uid), uid = [uid{:}]; else uid = uid(:); end