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# Random vector non repeated otherwise create new vector

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Yigitalp Ozmen am 12 Jul. 2019
Geschlossen: MATLAB Answer Bot am 20 Aug. 2021
Hello,
I have number list from 1 to 5. We know there are 120 different permutation for these. I want to write a rule that for my algorithm, I want to create a permutation that does not creaated before. For example,
1 2 3 4 5 first
2 3 4 5 1 second
...
2 3 4 5 1 nth it shouldn't be created. It is already in the second iteration.
So, by this manner creations should end at most 120th trial.
Can you help me solve this? I'm using randperm
Thank you.
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Guillaume am 12 Jul. 2019
randperm doesn't keep track of previously generated permutations, so it's never going to be useful for this.
Why can't you just generate at once the 120 permutations (with perm) and shuffle them if needed?
Stephen23 am 12 Jul. 2019
Create all permutations, then pick randomly.

### Antworten (2)

Brendan Hamm am 12 Jul. 2019
p = perms(1:5);
idx = randi([1,size(p,1)]);
selection = p(idx,:)
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Yigitalp Ozmen am 12 Jul. 2019
Thank you for your answers. What about for bigger numbers such as 10. Matlab cant generate 10!. But maybe it can generate permutations different from previous ones. Is it achivable?
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