GUI

hi... Can you please tell me how to access GUI (Graphical User Interface) variables in command window? Actually I have declared a button in the GUI and before this button a code runs "a=2" after pressing this button, I want to increment in this variable "a" in the command window. How may I access this variable in command window. Help me, thanks.

[Walter Roberson]

I am confused. Are you trying to use the command window to control variables in the GUI, or are you trying to use the GUI to control the command window?

[Dmitry]

If you want to get access to variable "a" from workspace in button callback you should declare "a" as global: "global a; a=2;". Then in button callback: "global a; a=a+1"; But if you use GUIDE I suppose you should not use command window, it's inconvenient.

[Abdullah Tahir]

Global does not work here. Global is efficient to access variables in different functions in GUI's m-file. But it is unable to export variables to command window.

Answer 1

[Luffy]

If you want to access data that is in base workspace in your gui functions, use

 v = evalin('base','name of variable u want to access');
 % the variable's data is now stored in v.

If u want to save data of ur gui work space to base, use

 assignin('base','name of variable u want to save','value of variable');

Several ways are shared in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

Answer 2

[Caleb]

% Intial value of a

a = 2;

setappdata(0,'a',a)

%%%%%%%%%%%%%

setappdata(0,'a',a+1) % Put this part within the callback function of the pushbutton

% Get the value of a

getappdata(0,'a')