Using a function to create a global variable in the workspace

I'm making a GUI to replace one m file, the m file creates several variables in the workspace and now I want to do the same in the GUI, some of the variables need to have global in their attributes, how can I use assignin or set the attribute in order to have global variables?

Thanks in advance and sorry for such a basic question, I searched before asking but didn't found the answer.

Answer 1

[Walter Roberson]

evalin(caller, 'global foo; foo=12345;');

[Paulo Silva]

evalin('caller', 'global foo; foo=12345;');

seems to work fine, thanks Walter

Is it possible to change the variables attributes like we do with the set function for objects?

[Walter Roberson]

I have not seen any reference to such a method. Global variables are considered to exist in a different workspace.

[Paulo Silva]

ok Walter thanks again :)