i have a vector which contain 23 elements.i wanna choose 20 elements among this 23 elements randomly.how can i do this?

i have a vector which contain 23 elements.i wanna choose 20 elements among this 23 elements randomly.how can i do this?

Answer 1

[Azzi Abdelmalek]

A=randi(50,1,23)  
out = A(randperm(23,20))

[fariba amini]

but i wanna have no replacment

[Azzi Abdelmalek]

out = A(sort(randperm(23,20)))

[fariba amini]

thanks a lot