# Assignment by copying: copy

### 12.2.9 Assignment by copying: copy

The copy command creates a copy of its argument, which is typically a list of some type. If B is a list and A := B, then A and B point to the same list, and so changing one will change the other. But if A:= copy(B), then A and B will point to different lists with the same values, and so can be changed individually.

#### Example.

Input:

B:= [[4,5],[2,6]]
A:= B
C:= copy(B)
A, B, C

Output:

⎡
⎢
⎣

4 | 5
2 | 6

⎤
⎥
⎦

,

⎡
⎢
⎣

4 | 5
2 | 6

⎤
⎥
⎦

,

⎡
⎢
⎣

4 | 5
2 | 6

⎤
⎥
⎦

Input:

B[1] =< [0,0]
A, B, C

Output:

⎡
⎢
⎣

4 | 5
0 | 0

⎤
⎥
⎦

,

⎡
⎢
⎣

4 | 5
0 | 0

⎤
⎥
⎦

,

⎡
⎢
⎣

4 | 5
2 | 6

⎤
⎥
⎦