Reading file delivery problem

I want the .txt message ([Nodelocation]) read by pushbutton2 to be used on pushbutton1, but pushbutton1 can't read the data of pushbutton2. How do I write it?

function pushbutton2_Callback(hObject, eventdata, handles)
[file,filepath] = uigetfile('*.txt');
if isempty(file); return; end   %user cancel
fullname = fullfile(filepath, file);
[Nodelocation] = textread(fullname);

% --- Executes on button press in Topology.
function pushbutton1_Callback(hObject, eventdata, handles)

[UElocation] = textread('observe/mdUELocationforGUI2.txt');
[AssignCell] = textread('observe/AssignCell.txt');
cla(handles.axes1,'reset');
axes(handles.axes1);
for ii=1:length(Nodelocation(:,1))
    for jj=1:length(UElocation(:,1))
        if AssignCell(jj,2) == Nodelocation(ii,1)
            
            if Nodelocation(ii,1) == 0
                scatter(Nodelocation(ii,2),Nodelocation(ii,3),150,[1 0 0],'^','filled');
                hold on;
                scatter(UElocation(jj,2),UElocation(jj,3),50,[1 0 0],'x');
                hold on;
            end
        end
    end
end

Answer 1

[Rik]

Store the result back to your guidata struct in your first callback.

You do need to make sure that clicking on the second button first does not cause any errors.