How to use a same variable to functions in Gui?

I have used the Gui to build the a programm. I would like when the user to click on menu item A, a number is stored in a variable. When the user click on menu item B, another number is stored in the same variable.

I want to use this variable in other function, in a loop. So, I'm trying that. Since now, I thank you for attention.

[Shameer Parmar]

Are you sure you want to click on menu item ? OR you want to say push button of GUI?

[Daniel Fonsêca]

Menu item

Answer 1

[Daniel Fonsêca]

I got to solve that problem. I used the function "assignin()" to store a variable and its value. To acess that variable, I use "evalin"

[Stephen23]

Magically accessing variables in other workspaces is one way that beginners write slow, complex, buggy code. It is much more reliable and more efficient to pass variables properly as input/output arguments, to use guidata, to use setappdata and getappdata, or to use nested functions:

https://www.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html

https://www.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html

[Daniel Fonsêca]

Thanks Stephen. But, do you know a way to transfer the datas without use the workspace? And, How I can clear the workspace after I use the programm?

[Stephen23]

@Daniel Fonsêca: you change your approach to writing GUI's.

A much better approach is to pass the data to a GUI when it is called, process the data entirely within the GUI workspaces, and then return the data when the GUI closes (the waitfor command is critical here). A lot of well written code loads, processes data, and saves all without touching the base workspace at all.

See this for a simple example of passing data into and back from a GUI:

https://www.mathworks.com/matlabcentral/fileexchange/48930-interactive-regular-expression-tool

Clearing a workspace is rarely required in well written code: functions, which have independent workspaces, have their memory usage managed automatically by MATLAB.