How to avoid duplication of random numbers?

clc;
clear all;
n=10;
rng(1);
reply_timer=randi(10);
fprintf('The reply_timer is %i\n',reply_timer);
i=1;
t=15;
while(1) 
    
    if(reply_timer<t)
        
        rng 'shuffle'
        node=randi(n);
        fprintf('The node %d is selected for simulation\n',node);
        reply_timer=reply_timer+1;
    else
        break;
    end
end

Output:

The reply_timer is 5

The node 8 is selected for simulation

The node 1 is selected for simulation

The node 3 is selected for simulation

The node 1 is selected for simulation

The node 5 is selected for simulation

The node 7 is selected for simulation

The node 7 is selected for simulation

The node 7 is selected for simulation

The node 10 is selected for simulation

The node 2 is selected for simulation

>>

Here in the output i got 1,7 repeated. I used 'shuffle ' to avoid the duplication still in the result some duplication occur. How can i avoid this problem. Can anyone suggest me some hint to sort this problem? Thank you

Answer 1

[Walter Roberson]

node_sequence = randperm(n, t-reply_timer);

Now use the elements of node_sequence, in that order.

You will quickly get an error if reply_timer is generated as 1, 2, 3, or 4. That is because it is impossible to generate 11 or more different numbers in the range 1 to 10 (n)