Simple:
x = 1:10;
y = x + 10; % for example
% x and y are both [1x10] row vectors as you mentioned
z = [x(:), y(:)];
% z is a [10x2] matrix of
% [x1, y1;
% x2, y2;
% .....
% xn, yn]
And if you want it back in 'row' form, just transpose z using an apostrophe '
