How to merge tow rows in one row?

Hello every body

1 2 3 4

5 6 7 8

9 10 11 12

I have the above matrix and i want to merge the first and second row to be like that:

B = [ 1 2 3 4 5 6 7 8 ].

Answer 1

[Alan Stevens]

Like so

A = [ 1     2     3     4
     5     6     7     8
     9    10    11    12];
B = [A(1,:) A(2,:)];

[Mr.Hamza]

it is perfect, thanks