How to shuffle rows in pairs in a 600 x 2 matrix that only contains integers?

Hello. I have a 600 x 2 matrix called 'File', which only contains the following integers, in sequence:

10 1

30 2

50 1

70 8

90 3

10 5

40 6

50 2

(and the list repeats itself up to row 600).

I want to shuffle (randomize) the order of the rows in pairs, so row 2 is always preceded by row 1, row 4 is always preceded by row 3, and so on. Like each pair of rows was grouped.

a 600 x 1 matrix. They can have only 8 values, let's say 1, 2, 3, 4, 5, 6, 7, and 8. I want to randomize the order of the rows but in pairs so 1 is always followed by 2, and 3 is always followed by 4, 5 is always followed by 6, and 7 is always followed by 8. Like there were only 4 elements: 1-2, 3-4, 5-6, and 7-8. But in pairs in rows (within the same column).

Thank you!

[Arif Hoq]

so, how about this ? i guess,same query.

https://www.mathworks.com/matlabcentral/answers/1678234-how-to-shuffle-rows-in-pairs?s_tid=srchtitle

[Neuro]

Yes, but I didn't get the correct response so I decided to add more details here.

Answer 1

[Jan]

A = [10 1; ...
     30 2; ...
     50 1; ...
     70 8; ...
     90 3; ...
     10 5; ...
     40 6; ...
     50 2];
s = size(A);
B = reshape(A, 2, s(1)/2, s(2));
B = B(:, randperm(s(1)/2), :);
B = reshape(B, s)

B = 8×2

50 1 70 8 90 3 10 5 10 1 30 2 40 6 50 2

[Neuro]

Thanks, this worked like a charm! :)