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: piv_AnalyzeSingle_Callback.m
    path of file: ./repos/PIVlab/+piv_NameSpace
    
    the code of the file until where you have to start completion: function piv_AnalyzeSingle_Callback(~, ~, ~)
handles=gui_NameSpace.gui_gethand;
ok=gui_NameSpace.gui_checksettings;
if ok==1
	resultslist=gui_NameSpace.gui_retr('resultslist');
	set(handles.progress, 'string' , ['Frame progress: 0%']);
	set(handles.Settings_Apply_current, 'string' , ['Please wait...']);
	gui_NameSpace.gui_toolsavailable(0,'Busy, please wait...');drawnow;

    
function piv_AnalyzeSingle_Callback(~, ~, ~)
handles=gui_NameSpace.gui_gethand;
ok=gui_NameSpace.gui_checksettings;
if ok==1
	resultslist=gui_NameSpace.gui_retr('resultslist');
	set(handles.progress, 'string' , ['Frame progress: 0%']);
	set(handles.Settings_Apply_current, 'string' , ['Please wait...']);
	gui_NameSpace.gui_toolsavailable(0,'Busy, please wait...');drawnow;
	handles=gui_NameSpace.gui_gethand;
	filepath=gui_NameSpace.gui_retr('filepath');
	selected=2*floor(get(handles.fileselector, 'value'))-1;
	ismean=gui_NameSpace.gui_retr('ismean');
	if size(ismean,1)>=(selected+1)/2
		if ismean((selected+1)/2,1) ==1
			currentwasmean=1;
		else
			currentwasmean=0;
		end
	else
		currentwasmean=0;
	end
	if currentwasmean==0
		tic;
		[image1,~]=import_NameSpace.import_get_img(selected);
		[image2,~]=import_NameSpace.import_get_img(selected+1);
		%if size(image1,3)>1
		%image1=uint8(mean(image1,3));
		%image2=uint8(mean(image2,3));
		%disp('Warning: To optimize speed, your images should be grayscale, 8 bit!')
		%end