Converting a Matlab code into Julia

New to Julia
18 
A = [1,2,3]

means you have a variable A bound to an object [1,2,3]:

A --------> [1,2,3]

When you write B = A you get

A ----------v
            [1,2,3]
B-----------^

So if we do e.g. A[1] = 2 we will have

A ----------v
            [2,2,3]
B-----------^

and thus B[1] == 2.

If you do B = copy(A) you get

A --------> [1,2,3]
B --------> [1,2,3]

Now if you do A[1] = 2 you get

A --------> [2,2,3]
B --------> [1,2,3]

so in this case B[1] = 1.

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