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: extract_load_polyline_Callback.m
    path of file: ./repos/PIVlab/+extract_NameSpace
    
    the code of the file until where you have to start completion: function extract_load_polyline_Callback (caller,~)
filepath=gui_NameSpace.gui_retr('filepath');
handles=gui_NameSpace.gui_gethand;
if size(filepath,1) > 1 %did the user load images?
	[polyfile,polypath] = uigetfile('*.mat','Load coordinate','PIVlab_coordinates.mat');
	if isequal(polyfile,0) | isequal(polypath,0)
		%do nothing
	else
		loading_correct_data=0;
		load(fullfile(polypath,polyfile),'xposition','yposition','extract_type');
		if ~isempty(xposition) && ~isempty(yposition) && ~isempty(extract_type)

    
function extract_load_polyline_Callback (caller,~)
filepath=gui_NameSpace.gui_retr('filepath');
handles=gui_NameSpace.gui_gethand;
if size(filepath,1) > 1 %did the user load images?
	[polyfile,polypath] = uigetfile('*.mat','Load coordinate','PIVlab_coordinates.mat');
	if isequal(polyfile,0) | isequal(polypath,0)
		%do nothing
	else
		loading_correct_data=0;
		load(fullfile(polypath,polyfile),'xposition','yposition','extract_type');
		if ~isempty(xposition) && ~isempty(yposition) && ~isempty(extract_type)
			if strcmp (caller.Parent.Tag,'multip12') %called from polyline panel
				if strcmp(extract_type, 'extract_poly') || strcmp(extract_type, 'extract_circle') || strcmp(extract_type, 'extract_circle_series')
					loading_correct_data=1;
				end