swaping 2 random numbers from array

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

Answer 1

[Bruno Luong]

ij = randperm(length(x)-1,2)+1;
x(ij) = x(flip(ij));

[saphir alexandre]

thank you, how would i store this new order in a different varaiable?

[Bruno Luong]

Simply copy it

y = x;
ij = randperm(length(y)-1,2)+1;
y(ij) = y(flip(ij));

[saphir alexandre]

thank you