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matrix with all possible combinations of 8!

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Erika Puiutta
Erika Puiutta on 30 Jan 2019
Answered: Erika Puiutta on 30 Jan 2019
Hello!
I have a vector a = 1:8 and want all different combinations of these numbers where each number can only occur once in each row. So i want
12345678
12345687
12345867
12345876
and so on.
I've been stuck on this for hours, I have googled and used allcomb but that leads to rows like 11111118 and I can't seem to figure out how to only get the rows where each number is represented only once. Can anyone help me?

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Answers (3)


Jos (10584)
Jos (10584) on 30 Jan 2019
You need permutations not combinations (which my function allcomb returns).
Take a look at PERMS
>> perms(1:3)
3 2 1
3 1 2
2 3 1
2 1 3
1 3 2
1 2 3

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Erika Puiutta
Erika Puiutta on 30 Jan 2019
Thank you guys so much!
I was so sure there would be a single function that does this, but I just couldn't find it for the life of me. Thanks again!

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