Clear Filters
Clear Filters

randomly shuffle the matrix by taking two rows

6 views (last 30 days)
For example, if I have
1 5 9 13 17 20
2 6 10 14 18 21
3 7 11 15 19 22
4 8 12 16 20 23
I want to have a function that can shuffle the columns around while keeping the values in the column the same. I want it done by taking two columns together.For example:
9 13 17 20 1 5
10 14 18 21 2 6
11 15 19 22 3 7
12 16 20 23 4 8
In other words, the first two columns were taken together, the next two columns were taken together and randomly mixed in that way.
(Note : My matrix is normally a very large matrix. That's why I wanted to do it with code)
Can you help me to code this?
Thank you.

Accepted Answer

Voss
Voss on 21 Mar 2022
A = [1 5 9 13 17 20
2 6 10 14 18 21
3 7 11 15 19 22
4 8 12 16 20 23];
new_idx = randperm(size(A,2)/2)*2-[1; 0]
new_idx = 2×3
5 3 1 6 4 2
A = A(:,new_idx(:)) % A(:,[5 6 3 4 1 2])
A = 4×6
17 20 9 13 1 5 18 21 10 14 2 6 19 22 11 15 3 7 20 23 12 16 4 8
  4 Comments
Berfin Çetinkaya
Berfin Çetinkaya on 21 Mar 2022
Yes this is exactly what i want. Thank you very much.

Sign in to comment.

More Answers (0)

Categories

Find more on Creating and Concatenating Matrices in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!