Wher variable "j" is declared as local?

General Usage
1 
julia> function my_fu()
           global j
           println(j)
       end
my_fu (generic function with 1 method)

julia> for j=1:3
            global j
            my_fu()
        end
ERROR: syntax: variable "j" declared both local and global
2

You are implicitly declaring j locally in your for loop.

Try

for i ∈ 1:3 
    global j = i
    my_fu()
end
1 Like
3

Works, why ?:slight_smile:

∈== in

?

4

It’s just an alternate syntax that’s available in Julia. It is exactly equivalent to in. Note that if you are using a Julia (or other latex-to-unicode) plugin on your editor you can just type in \in, either hit tab or space, and the replacement will be made for you.

Of course, this has nothing to do with why your original code was failing.

2 Likes