MATLAB: Forming matrix using vector

matrix

Hi, i need to form a matrix using this vector a=[ 1 2 3 5 6 7 8 9 2 1 2], the matrix elements be A=[1 2 3 4 5 6; 7 8 9 2 1 2]

i used reshape command but it doesn't give me the sequence i want.

 a=[ 1 2 3 4 5 6 7 8 9 2 1 2];
 reshape(a,6,2)'

Maybe you ask for this:

   D = reshape([a.' circshift(a.',-1)], [], 2);
   D(size(a,2):size(a,2):end,:)=[];
   out =[D fliplr(D)]

a=[1 2 3 4 5 6 7 8 9]
reshape(a,3,3)