A query on gui

Hello,

I am looking for an answer to a question on GUI-Interface in MATLAB. Say let us consider the following code:-

function simpleGUI
    hFig = figure('Visible','off', 'Menu','none', 'Name','Calculator', 'Resize','off', 'Position',[100 100 350 200]);
    movegui(hFig,'center')          %# Move the GUI to the center of the screen

      hBtnGrp = uibuttongroup('Position',[0 0 0.3 1], 'Units','Normalized');
      uicontrol('Style','Radio', 'Parent',hBtnGrp, 'HandleVisibility','off', 'Position',[15 150 70 30], 'String','Add', 'Tag','+')
      uicontrol('Style','Radio', 'Parent',hBtnGrp, 'HandleVisibility','off', 'Position',[15 120 70 30], 'String','Subtract', 'Tag','-')
      uicontrol('Style','Radio', 'Parent',hBtnGrp, 'HandleVisibility','off', 'Position',[15  90 70 30], 'String','Multiply', 'Tag','*')
      uicontrol('Style','Radio', 'Parent',hBtnGrp, 'HandleVisibility','off', 'Position',[15  60 70 30], 'String','Divide', 'Tag','/')

      uicontrol('Style','pushbutton', 'String','Compute', 'Position',[200 50 60 25], 'Callback',{@button_callback})

      hEdit1 = uicontrol('Style','edit', 'Position',[150 150 60 20], 'String','10');
      hEdit2 = uicontrol('Style','edit', 'Position',[250 150 60 20], 'String','20');
      hEdit3 = uicontrol('Style','edit', 'Position',[200  80 60 20], 'String','');

      hEdit3
      set(hFig, 'Visible','on')        %# Make the GUI visible

      %# callback function
      function button_callback(src,ev)
          v1 = str2double(get(hEdit1, 'String'));
          v2 = str2double(get(hEdit2, 'String'));
          switch get(get(hBtnGrp,'SelectedObject'),'Tag')
              case '+',  res = v1 + v2;
              case '-',  res = v1 - v2;
              case '*',  res = v1 * v2;
              case '/',  res = v1 / v2;
              otherwise, res = '';
          end
          set(hEdit3, 'String',res)
      end
  end

My question is :- from the function button_callback is it possible to return any value to simpleGUI? Say I want to return the summation value of 2 nos? Is it possible to return the value and print the sum in the calling function i.e. in simpleGUI?

Answer 1

[Walter Roberson]

No, those kind of callback functions can never return a value. See instead http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F