randomly shuffle the matrix by taking two rows

2022 3 21
1 个回答
回答已采纳
更新时间：2022 3 21
4 次查看（30 天）

0 个投票

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.

请先登录，再回答此问题。

 采纳的回答

Voss
Voss 2022-3-21
Ran in:

0 个投票

Ran in:
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 个评论
显示 2更早的评论 隐藏 2更早的评论

Berfin Çetinkaya
Berfin Çetinkaya 2022-3-21
I actually didn't want that.
I have a matrix like this:
1 9 8 5 3 9
3 7 7 4 1 10
4 10 6 2 4 9
4 9 7 1 3 5
I want to mix it randomly. But I want it in twos.
Example :
8 5 3 9 1 9
7 4 1 10 3 7
6 2 4 9 4 10
7 1 3 5 4 9
I tried your codes but it didn't give the result I wanted.
Voss
Voss 2022-3-21
Ran in:
Ran in:
It does exactly what you are saying:
A = [1 9 8 5 3 9
3 7 7 4 1 10
4 10 6 2 4 9
4 9 7 1 3 5];
new_idx = randperm(size(A,2)/2)*2-[1; 0];
A = A(:,new_idx(:))
A = 4×6
8 5 3 9 1 9 7 4 1 10 3 7 6 2 4 9 4 10 7 1 3 5 4 9
Berfin Çetinkaya
Berfin Çetinkaya 2022-3-21
Yes this is exactly what i want. Thank you very much.

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Logical 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by