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: getfromjsonpath.m
    path of file: ./repos/iso2mesh
    
    the code of the file until where you have to start completion: function obj=getfromjsonpath(root, jsonpath)
%
%    obj=getfromjsonpath(root, jsonpath)
%
%    Query and retrieve elements from matlab data structures using JSONPath
%
%    author: Qianqian Fang (q.fang <at> neu.edu)
%
%    input:
%        root: a matlab data structure like an array, cell, struct, etc
%        jsonpath: a string in the format of JSONPath, see loadjson help
%
%    output:
%        obj: if the specified element exist, obj returns the result

    
function obj=getfromjsonpath(root, jsonpath)
%
%    obj=getfromjsonpath(root, jsonpath)
%
%    Query and retrieve elements from matlab data structures using JSONPath
%
%    author: Qianqian Fang (q.fang <at> neu.edu)
%
%    input:
%        root: a matlab data structure like an array, cell, struct, etc
%        jsonpath: a string in the format of JSONPath, see loadjson help
%
%    output:
%        obj: if the specified element exist, obj returns the result
%
%    example:
%        getfromjsonpath(struct('a',[1,2,3]), '$.a[1]')      % returns 2
%
% license:
%     BSD or GPL version 3, see LICENSE_{BSD,GPLv3}.txt files for details 
%
% -- this function is part of JSONLab toolbox (http://iso2mesh.sf.net/cgi-bin/index.cgi?jsonlab)
%

obj=root;
jsonpath=regexprep(jsonpath,'([^.])(\[\d+\])','$1.$2');
[pat,paths]=regexp(jsonpath,'\.*([^\s\.]+)\.*','match','tokens');
if(~isempty(pat) && ~isempty(paths))
for i=1:length(paths)
    if(strcmp(paths{i}{1},'$'))
        continue;
    elseif(regexp(paths{i}{1},'$\d+'))
        obj=obj(str2double(paths{i}{1}(2:end