I assume the first line should be > X = [1,2]; Y = [3,4];
Then the results you get makes sense. The thing is that julia has mutable arrays, and the ! at the end of append! indicates that it is a function that mutates it's argument.
I assume the first line should be > X = [1,2]; Y = [3,4];
Then the results you get makes sense. The thing is that julia has mutable arrays, and the ! at the end of append! indicates that it is a function that mutates it's argument.