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How to use GUI to change a value of a variable and use that variable in a script

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I have a program that opens a GUI while its running, the thing is I want the user to press one of the buttons on the GUI. the user selection should change the value of the variable. and then the main program continue running after the GUI.
my problem is that I don't know how to make a button event and how to get the value of the variable back to the main program?

Answers (2)

Jan on 21 Aug 2017
You can either use GUIDE or create the GUI prgrammatically by code. Perhaps a simple inputdlg, questdlg or listdlg is sufficient already. See
doc inputdlg
doc questdlg
doc listdlg
Creating an own dialog and obtaining a value is easy also:
function Reply = myFirstGUI
FigH = figure('Position', [100, 100, 400, 300], ...
'Menubar', 'none');
ButtonH = uicontrol('Style', 'PushButton', 'String', 'Click me!', ...
'Position', [20, 20, 360, 30], ...
'Callback', {@myCallback, FigH});
disp('Waiting for the figure to close...');
disp('Waiting was resumed...');
Reply = '???' % You did not explain, how the GUI creates the value to be replied
function myCallback(ButtonH, EventData, FigH)
disp('Button was pressed.');
Now call this from the main function:
Reply = myFirstGUI();

Walter Roberson
Walter Roberson on 21 Aug 2017
faster_button = uicontrol('style','push', 'UserData', 0, 'callback', @faster);
function faster(hObject, event)
current_speed = get(hObject, 'UserData');
current_speed = current_speed + 10;
set(hObject, 'UserData', current_speed);
while true
current_speed = get(faster_button, 'UserData');
x = x + current_speed;
scatter(x, current_speed);
hold on;
pause(1); %also triggers drawing
Note here that pushing the button does not force the script to change the value it is using: the script has to ask what the current value is.


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