Global variables in GUI
9 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Hi everyone, I have a problem with global variable in matlab GUI. I have a main window with options that i want to be active only after setting previous options. That options are placed in menu editor. So I have:
function PREV_OPTION_Callback(hObject, eventdata, handles)
global PREV_OPTION_set;
PREV_OPTION_menu;
if(PREV_OPTION_set)
set (handles.NEXT_OPTION,'enable','on','foregroundcolor',[0 0 0]); % next option is available
end
PREV_OPTION_set is beeing changed in PREV_OPTION_menu to value of 1. While debbuging everything is ok - PREV_OPTION_set equals to 1, but while running the program code in if scope is running since second callback function launch (after second clicking on PREV_OPTION from menu). What is wrong?
1 comentario
Adam
el 19 de Dic. de 2017
It would be a lot easier if you just returned a relevant argument from your PREV_OPTION_menu function. These are the type of errors you get when using global variables.
Respuestas (1)
Walter Roberson
el 19 de Dic. de 2017
If PREV_OPTION_menu is a script that is changing PREV_OPTION_set, and if PREV_OPTION_menu does not itself use "global" in talking about the variable, then the Just In Time compiler might not notice that the variable is changed.
If PREV_OPTION_menu is a function that is changing PREV_OPTION_set and PREV_OPTION_Menu does not use "global" in talking about the variable, then as far as MATLAB is concerned the global variable is not changed.
2 comentarios
Ver también
Categorías
Más información sobre Environment and Settings en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!