1 >> m=[1,1,2,2,3];
 2 >> m
 3 
 4 m =
 5 
 6      1     1     2     2     3
 7 
 8 >> b=unique(m)
 9 
10 b =
11 
12      1     2     3

 1 >> a=[1,2,3,2;5,2,9,7;8,0,6,3];
 2 >> a
 3 
 4 a =
 5 
 6      1     2     3     2
 7      5     2     9     7
 8      8     0     6     3
 9 
10 >> b=unique(a);
11 >> b
12 
13 b =
14 
15      0
16      1
17      2
18      3
19      5
20      6
21      7
22      8
23      9