MATLAB: How to generate unique random integers between 1 to n (no two should be same)

Question

Hello I want to generate (<n) unique random integers varying from 1 to n. I used the existing randint function which seems to be producing identical numbers between.

This is the line of code that I'm using

k = randint(l,1,(a(1)*a(2))-1)+1;

Answer 1

n = 8
l = 5
out = randperm(n,l)

OR

out1 = randperm(n)
out = out1(1:l)