Declaring a global variable

hello guys i need to declare and define a global variable X1 to 0 in a gui callback and i need to use this variable and its value 0 in another callback function.how do i do this.pls help

Answer 1

[William]

global X1 = 0 % use all caps for global

I would advise against using global variables as they can be difficult to debug sometimes. Just my 2 cents