Random shuffle of vector elements

12 views (last 30 days)
How to randomly shuffle all elements of the vector except the first and last position?
For example:
I have vector A=[5 1.5 1.6 1.7 5] and I want to randomly shuffle 2nd, 3rd 4th element while the 1st and the last will stay the same.
Thank you

Accepted Answer

Constantino Carlos Reyes-Aldasoro
This can be easily done by addressing the vector correctly. First you need a random order to shuffle your elements. You can do that by using rand and then sort:
a = 1×3
0.0591 0.2095 0.2737
b = 1×3
3 2 1
so b will be the order. Now you need to use that to re-order your vector, let's call the new vector A2:
A=[5 1.5 1.6 1.7 5];
A2 = [A(1) A(b+1) A(end)]
A2 = 1×5
5.0000 1.7000 1.6000 1.5000 5.0000
Now you have a new vector with the first and last same as they were, but 2:4 have been randomly shuffled.
Hope this solves your question.

More Answers (1)

Fangjun Jiang
Fangjun Jiang on 5 Oct 2021
  1 Comment
Fangjun Jiang
Fangjun Jiang on 5 Oct 2021
do it in one shot
index=[ones(6,1), p, 5*ones(6,1)];

Sign in to comment.


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!