How to restructure/reshape matrix?

Hi, I am still novice using Matlab I wonder if it's possible to restructure matrix from :

a=[1
   2
   4
   5
   7
   8
   10
   9
   12
   19
   22
   21]

to be like this:

a= [1 2 4;
    2 4 5;
    4 5 7;
    5 7 8;
    7 8 10;
    8 10 9;
    10 9 12;
    9 12 19;
    12 19 22;
    19 22 21]

Thank You

Answer 1

[Stephen23]

This is easy with hankel, some indexing, and transpose:

>> a = [1,2,4,5,7,8,10,9,12,19,22,21];
>> c = hankel(a(1:3),a(3:end)).'
c =
    1    2    4
    2    4    5
    4    5    7
    5    7    8
    7    8   10
    8   10    9
   10    9   12
    9   12   19
   12   19   22
   19   22   21

And compared against your requested output:

>> b = [1,2,4;2,4,5;4,5,7;5,7,8;7,8,10;8,10,9;10,9,12;9,12,19;12,19,22;19,22,21]
b =
    1    2    4
    2    4    5
    4    5    7
    5    7    8
    7    8   10
    8   10    9
   10    9   12
    9   12   19
   12   19   22
   19   22   21
>> isequal(b,c)
ans = 1