How can I make randi() in a loop not choose the same number

I have an array

x=zeros(1,36)

then i have inside a while loop:

while ....
y=randi(length(x));
z=randi(length(x));

How can i make it so that this doesnt choose the same number at all,

Note: the loop will end before it gets to 36 choices, so its not that it doesnt have a choice but to go over the same numbers again

Answer 1

[Walter Roberson]

That would be a bit difficult. You would have to find a random number seed that you could set such that randi(36) happens to produce a permutation of the numbers 1 : 36. It could take a fair bit of work to find such a seed.

I would suggest that you take a completely different approach:

rand_y = randperm(length(x));
rand_z = randperm(length(x));

for K = 1 : length(x)
   y = rand_y(K);
   z = rand_z(K);
   stuff
   if some conditon;
     break;
   end
end