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

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Neuro
Neuro 2022-3-23
评论： Neuro 2022-3-23
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!

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Jan
Jan 2022-3-23
编辑：Jan 2022-3-23
Ran in:
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

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