MATLAB: How to create global variables in a GUI m-file

global variablegui

To simplify the question, I will suppose a GUI including two buttons; button1 and button2. During the running of button1 callback the m code creates variables; some of these variables will be needed during the button2 callback. The question is: Can I create and set up global variables in a GUI m-file which could be used in all internal functions ?

Best Answer

Place a line like

global myVariable1;

in every function that needs to see the variable. Functions without that line won't be able to see the variable.

For other recommended ways, see the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

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MATLAB: Gui

In matlab, scope of a variable is limited to the function in which is declared. If u want to share the variable between multiple functions, then declare it as 'global' in each function which access it. In your case it should be

push button1
global a;
a = [1 2 3 4];
push button2
glabal a;
xlswrite('a.xlsx',a);

Find more on

http://www.mathworks.in/help/techdoc/matlab_prog/f0-38052.html

http://www.mathworks.in/help/techdoc/ref/global.html

MATLAB: Reset GUI M-File

Delete the associated .m file and reopen the GUI in GUIDE. In GUIDE, open Tools > GUI options... check "Generate FIG file and MATLAB file" and save the GUI.

Best Answer

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MATLAB: Gui

MATLAB: Reset GUI M-File

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