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: delete.m
    path of file: ./repos/ExploreASL/External/SPMmodified/@xmltree
    
    the code of the file until where you have to start completion: function tree = delete(tree,uid)
% XMLTREE/DELETE Delete (delete a subtree given its UID)
% 
% tree      - XMLTree object
% uid       - array of UID's of subtrees to be deleted
%__________________________________________________________________________

    
function tree = delete(tree,uid)
% XMLTREE/DELETE Delete (delete a subtree given its UID)
% 
% tree      - XMLTree object
% uid       - array of UID's of subtrees to be deleted
%__________________________________________________________________________
%
% Delete a subtree given its UID
% The tree parameter must be in input AND in output
%__________________________________________________________________________
% Copyright (C) 2002-2011  http://www.artefact.tk/

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

%error(nargchk(2,2,nargin));

uid = uid(:);
for i=1:length(uid)
    if uid(i)==1
        warning('[XMLTree] Cannot delete root element.');
    else
        p = tree.tree{uid(i)}.parent;
        tree = sub_delete(tree,uid(i));
        tree.tree{p}.contents(find(tree.tree{p}.contents==uid(i))) = [];
    end