Reshape matrix with multiple columns into 2 columns

Noticed that matlab has function of reshaping matrix into specific size, but is it possible to move 2 by 2 columns, for exapmle, 3 & 4th columns below 1 & 2nd columns, so far so on?

From A to B:

A = [1 2 3 4;5 6 7 8;9 10 11 12]

B = [1 2;5 6;9 10;3 4;7 8;11 12]

Thank you =]

Answer 1

[KSSV]

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

iwant  = [A(:,1:2) ; A(:,3:4)]

[lim xiang]

Hi, thank you very much for your reply, realized that I can add a loop to group multiple columns of matrix

Answer 2

[Stephen23]

Of course, here are two general solutions.

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

A = 3×4

1 2 3 4 5 6 7 8 9 10 11 12

B = [1,2;5,6;9,10;3,4;7,8;11,12] % desired output

B = 6×2

1 2 5 6 9 10 3 4 7 8 11 12

Method one: MAT2CELL and concatentation:

C = mat2cell(A,3,[2,2]);
B = vertcat(C{:})

B = 6×2

1 2 5 6 9 10 3 4 7 8 11 12

Method two: use RESHAPE and PERMUTE.

B = reshape(permute(reshape(A.',2,2,3),[1,3,2]),2,[]).'

B = 6×2

1 2 5 6 9 10 3 4 7 8 11 12

You do not need to use a loop!