How do I get variables from callback functions in MATLAB

I programmed a pushbutton that I want to call to @GetValue function.

The GetValue function creates 2 variables (PupilColumn,BehavColumn). I don't know how to take these variables out from the @GetValue function in order to use them later. How should I program it correctly?

[PupilColumn,BehavColumn]=CreatePush(Figure_h,ColumnPupil_h,ColumnBehav_h)

function  CreatePush(Figure_h,ColumnPupil_h,ColumnBehav_h)
PushButton_h = uicontrol(Figure_h, 'Style', 'push', 'String', 'Next', ...
    'Position', [600 20 120 50], ...
    'CallBack',{@GetValue,ColumnPupil_h,ColumnBehav_h}, ...
    'UserData',0);
end

function [PupilColumn,BehavColumn] = GetValue(PushButton_h,ed,ColumnPupil_h,ColumnBehav_h)

Answer 1

[Walter Roberson]

Daniel is correct that callbacks cannot return anything. See the FAQ on this topic for various methods.

[Daniel Shub]

Accepted by DES

Answer 2

[Daniel Shub]

I do not think that callback functions can return anything. The variables PupilColumn and BehavColumn can be added to the application data (setappdata) of either PushButton_h or Figure_h.

setappdata(Figure_h, 'PupilColumn', PupilColumn);

Then when you want to use PupilColumn

PupilColumn = getappdata(Figure_h, 'PupilColumn');

This requires you to know Figure_h in order to get PupilColumn.