MATLAB: How can i reorder NxM matrix into a 1D array

MATLABmatrix manipulation

I am looking to take a sample matrix below. The matrix will be large and looking for fast and non looping solution. Thank you.

a=[1 2 3;4 5 6;7 8 9];

reshape it into:

b=[7 8 9 4 5 6 1 2 3];

Using the reshape (link) function:

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

Use

 a = [1 2 3 4 5 6]; b = [7 8 9 10 11 12];
 c = reshape([a;b],1,[])

Use the reshape function:

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