MATLAB Answers



Asked by Abdullah Tahir on 4 Jun 2012
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
on 4 Jun 2012
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?
on 11 Jul 2012
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 on 25 Jul 2012
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.

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2 Answers

Answer by Luffy
on 11 Jul 2012
Edited by Ned Gulley on 11 Jul 2012
 Accepted Answer

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');


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Answer by Caleb
on 16 Jul 2012

% Intial value of a
a = 2;
setappdata(0,'a',a+1) % Put this part within the callback function of the pushbutton
% Get the value of a


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