could anyone help me how to pair the numbers in the desired manner as shown below

A=1:16
R = reshape(A,4,[])

After executing the above command results in

R =

     1     5     9    13
     2     6    10    14
     3     7    11    15
     4     8    12    16

Now I want to group the numbers in the desired manner

    1   2   3   4   5   6   7   8
    12  11  10  9   16  15  14  13

Could anyone please help me on this.

Answer 1

[Dyuman Joshi]

This looks a quite a unique manner. Anyways, try this

A=1:16;
R = reshape(A,4,[]);
[R(:,1)' R(:,2)'; flip(R(:,3))' flip(R(:,4))']

ans = 2×8

1 2 3 4 5 6 7 8 12 11 10 9 16 15 14 13

[jaah navi]

Thanks it works.

Could you please help me how to combine the following code of the same working principle

A=1:12
R = reshape(A,3,[])
R1=[R(:,1)' R(:,2)'; flip(R(:,3))' flip(R(:,4))']'

B=1:16;
R2 = reshape(B,4,[]);
R3=[R2(:,1)' R2(:,2)'; flip(R2(:,3))' flip(R2(:,4))']'

C=1:24
R4 = reshape(C,6,[])
R5=[R4(:,1)' R4(:,2)'; flip(R4(:,3))' flip(R4(:,4))']'

D=1:36
R6 = reshape(D,9,[])
R7=[R6(:,1)' R6(:,2)'; flip(R6(:,3))' flip(R6(:,4))']'

E=1:48
R8=reshape(E,12,[])
R9=[R8(:,1)' R8(:,2)'; flip(R8(:,3))' flip(R8(:,4))']'

In the above code A, B, C, D, E executes separately. But I need to combine all into a single code. Could you help me on this.

[Dyuman Joshi]

I am not sure what you mean by combining all into a single code, so here's my approach -

for i=[3 4 6 9 12]
z=1:4*i;
y=reshape(z,[],4);
R=[y(:,1)' y(:,2)'; flip(y(:,3))' flip(y(:,4))']
end

R = 2×6

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

R = 2×8

1 2 3 4 5 6 7 8 12 11 10 9 16 15 14 13

R = 2×12

1 2 3 4 5 6 7 8 9 10 11 12 18 17 16 15 14 13 24 23 22 21 20 19

R = 2×18

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 27 26 25 24 23 22 21 20 19 36 35 34 33 32 31 30 29 28

R = 2×24

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 36 35 34 33 32 31 30 29 28 27 26 25 48 47 46 45 44 43 42 41 40 39 38 37

Here R will be modified in each iteration. You can modify the code according to however you want to proceed.

[jaah navi]

Thanks for your help.

Answer 2

[Yongjian Feng]

reshape(A, 8, 2)'

[Dyuman Joshi]

This doesn't give the correct output

[Yongjian Feng]

Whoops. Didn't pay attention to the order of the second row.

Then we need to use flip most likely.

A=1:16
R = reshape(A,4,[]);
R(:, 3) = flip(R(:, 3));
R(:, 4) = flip(R(:, 4));
ret = reshape(R, 8, 2)'