how to define a user defined variable in matlab app without showing it in gui

i have variables which are user defined, but some of them have to be shown in gui and some not, so how to initialize those user defined variable without being shown in gui made.

[Rik]

Do you mean in the workspace tab, or in a GUI you created yourself?

[Rashi Mehrotra]

in the gui i created

[Jan]

I don't get it. The code

a = 5

creates a variable, which is not shown automatically in a user defined GUI. So what exactly is the problem?

[Adam Danz]

How does the user define the variable and in what workspace?