Global variables in MATLAB GUI?

matlab variables user-interface matlab-guide
Alvi Syahrin picture Alvi Syahrin · May 11, 2013 · Viewed 13.8k times · Source

I'm working with MATLAB GUI.

When I'm trying to access the variable which was defined with the push button, it is not defined in the pop up menu. The variables; it should be set 'global', so it is defined in the whole program. And I can use it in any callback.

Do you guys have any idea of how to make the variables 'global'?

Answer

rascob picture rascob · May 11, 2013

Wherever a global variable is going to be accessed in your code (say, different script files, functions etc.), it should be declared as such: global globalVariable;. Eg.:

function myGUI_OpeningFcn(hObject, eventdata, handles, varargin)
    global myGlobalVar;
    myGlobalVar = [...]
    [...]
end

function btnWriteFile_Callback(hObject, eventdata, handles)
    global myGlobalVar;
    if myGlobalVar [...]
    [...]
end

Notice that in both functions the variable is declared as global in order for them to access it.

Related questions

How to get the type of a variable in MATLAB?

Does MATLAB have a function/operator that indicates the type of a variable (similar to the typeof operator in JavaScript)?

Read More
Create variables with names from strings

Let's assume that I want to create 10 variables which would look like this: x1 = 1; x2 = 2; x3 = 3; x4 = 4; . . xi = i; This is a simplified version of what I'm intending to do. Basically I just want so save code lines by creating …

Read More
How do I do multiple assignment in MATLAB?

Here's an example of what I'm looking for: >> foo = [88, 12]; >> [x, y] = foo; I'd expect something like this afterwards: >> x x = 88 >> y y = 12 But instead I get errors like: ??? Too many output arguments. …

Read More