Rearrange any matrix Randomly with a specific sequence

Hello,

I have a Matrix A like this

A=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]'

I want to redistribute the matrix but I want to preserve a specifc sequence which is 5 here.

I mean I need a way to redistribute each five element randomly and assign them to a new matrix

for example:

the matrix B will be like this:

B=[6 7 8 9 10 11 12 13 14 15]'

the matrix C will be like this:

C=[ 1 2 3 4 5 16 17 18 19 20]'

Is that possible in MATLAB ?

Thanks,

[infinity]

Hello,

I suggest you to see the function "randperm"

https://it.mathworks.com/help/matlab/ref/randperm.html

It may help

[Mahmoud Khadijeh]

yes I know this function but I want the randomness to be in a specific sequence as I mentioned in my question.

Thanks

[KALYAN ACHARJYA]

It seems simple, it would be better to answer if you clearly elaborate the question?

For the following inputs

A=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]'

Apart from above B and C, what are other possible outputs?

[Mahmoud Khadijeh]

I just want to rearrange each five element in the matrix A randomly for example ,

If I run the code, I want the matrix A to be like this:

A=[16 17 18 19 20 1 2 3 4 5 11 12 13 14 15 6 7 8 9 10 ]'

if I run the code again, I want the matrix to be like this:

A=[1 2 3 4 5 16 17 18 19 20 6 7 8 9 10 11 12 13 14 15 ]'

regards,

Answer 1

[infinity]

Here is an example that you can refer

a = 1:20;
b = randperm(4);
n = length(b);
for i = 1:n
c(5*(i-1)+1:5*i) = a(5*(b(i)-1)+1:5*b(i));
end

[Mahmoud Khadijeh]

Thank you very much, that's what I want

Answer 2

[TADA]

A=1:20;
blockSize = 5;
nOutputBlocks = 2;
a=reshape(A,blockSize,[]);
i=sort(reshape(randperm(size(a,2)),[],nOutputBlocks),2);
B=reshape(a(:,reshape(i',1,[])),blockSize*nOutputBlocks,[])

[Mahmoud Khadijeh]

Thank you very much, that's works with me