How do u check for the existence of a variable in base workspace from main GUI file?

How do u check for the existence of a variable in base workspace from main GUI file?

Answer 1

[the cyclist]

I am not very knowledgeable about GUIs, so there is almost certainly a better way, but one way to do this would be with the evalin() function. Specifically, I think you could check for the existence of the variable x with

>> tf = evalin('base','exist(''x'')')

Type

>> doc evalin

for details.