Swap 3 random elements in an array

How do I randomly swap three elements in an array? The element at selected position one will be moved to selected position two, the previous element at selected position two will be moved to position three, and the element at position three will be moved to selected position one.

For example: a=[4 2 3 1 5 7 6] would become anew=[4 2 6 1 3 7 5]

Thank you

Answer 1

[Steven Lord]

Use randperm to select 3 elements (without replacement) from your vector.

a = [4 2 3 1 5 7 6]
ind = randperm(numel(a), 3)
a(ind) = a(ind([3 1 2]))

[Amine Ne]

Thank you Steven Lord, it works well

Answer 2

[KALYAN ACHARJYA]

% I have tried this only swap two elements or even numbers, definite swap with each other is only possible in even numbers.

a=randperm(7)
idx=randperm(3);
a(idx)=a(fliplr(idx))

I have tried in another way, you can do that

a=randperm(7)
n=randi(5);
new_array=a(:,:);
new_array([n n+1 n+2])=a([n+2 n n+1])

[Amine Ne]

Thank you KALYAN, It does not work for example a = [6 7 1 5 2 3 4] becomes [6 7 1 4 2 7 4].

[KALYAN ACHARJYA]

Wait I am doing, there is little an issue.

[KALYAN ACHARJYA]

I have added (Edited answer) another way, pls try, if OK pls confirm it

[Amine Ne]

The second solution allows to swap between 3 consecutive elements.

For example: a=randperm(7)=[7 5 4 1 2 3 6];

n=randi(5)=4; new_array=a(:,:);

new_array([n n+1 n+2])=a([n+2 n n+1])=[7 5 4 3 1 2 6]

I think it is good for me, Thank you KALYAN ACHARJYA for your help and your time.