How to choose 2 people randomly among 12 ?

Hi all,

Here is my question: I have a group of 12 peoples, Now I want to make a mini group by picking 2 of them by random. I've somehow done that, but the problem is that I want the result to be shown as a 2x1 vector, and not 2x2 matrix .

Here is my code:

Group={'ae','bk','cn','es','fh','hv','mh','ol','sd','sg','ss','ts'}; m=randi([1 12],2,1) % A 2x1 array of random numbers between 1 and 12 Minigroup=[Group{m(1)} ; Group{m(2)}]

As you see, size of the Minigroup is 2x2 . Any suggestions?

Thank you

Answer 1

[Wayne King]

Group={'ae','bk','cn','es','fh','hv','mh','ol','sd','sg','ss','ts'}; 
idx = randperm(12,2);
Group{idx}

I think you want to use randperm() instead of randi(), because randi() can give you the same index twice and presumably you want two different people.

[Negar]

Thank you for the randperm, you are absolutely right ! :)

And another thing, how can I remove these two persons from my category and make a new group excluding them?

Answer 2

[Wayne King]

Group={'ae','bk','cn','es','fh','hv','mh','ol','sd','sg','ss','ts'}; 
 idx = randperm(12,2);
 ind = setdiff(1:length(Group),idx);
 GroupNew = Group(ind);

[Negar]

Thank you again ! :)