swaping 2 random numbers from array

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hello,
I have an array x = [1,(randperm(20)+1)]
but i would like to swap 2 random numbers of that array while keeping 1 as my first integer
please let me know how to go about that

Accepted Answer

Bruno Luong
Bruno Luong on 28 Apr 2022
ij = randperm(length(x)-1,2)+1;
x(ij) = x(flip(ij));
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