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

Question

Tariq Hammoudeh 2022-1-8

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https://ww2.mathworks.cn/matlabcentral/answers/1625070-how-can-i-make-randi-in-a-loop-not-choose-the-same-number

回答： Walter Roberson 2022-1-8

采纳的回答： Walter Roberson

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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

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Answer 1

Walter Roberson 2022-1-8

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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