Use combvec for pairs of values

Hello,

I have a matrix (20 x 2) .

I would like to create 4 possible combinations of each pair of values present on each row of this matrix into a new matrix with 8 columns.

Basically, I would like to use combvec but instead of using scalars, I would be using pairs of values.

Any ideas?

Tnks

Answer 1

[M.MUSBA Elhadid]

a = repmat(a,2,4);

Answer 2

[DGM]

If there's only two columns, what's wrong with just doing

A = randi(9,20,2)

A = 20×2

8 4 8 6 7 8 4 1 7 6 3 8 1 5 5 6 1 3 9 5

B = A(:,[1 1 1 2 2 1 2 2])

B = 20×8

8 8 8 4 4 8 4 4 8 8 8 6 6 8 6 6 7 7 7 8 8 7 8 8 4 4 4 1 1 4 1 1 7 7 7 6 6 7 6 6 3 3 3 8 8 3 8 8 1 1 1 5 5 1 5 5 5 5 5 6 6 5 6 6 1 1 1 3 3 1 3 3 9 9 9 5 5 9 5 5