Reshape matrix with multiple columns into 2 columns

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lim xiang
lim xiang 2022-3-10
编辑： Stephen23 2022-3-10
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 =]

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KSSV
KSSV 2022-3-10
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)]
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lim xiang
lim xiang 2022-3-10
Hi, thank you very much for your reply, realized that I can add a loop to group multiple columns of matrix

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Stephen23
Stephen23 2022-3-10
编辑：Stephen23 2022-3-10
Ran in:
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!

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