Swap 3 random elements in an array
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How do I randomly swap three elements in an array? The element at selected position one will be moved to selected position two, the previous element at selected position two will be moved to position three, and the element at position three will be moved to selected position one.
For example: a=[4 2 3 1 5 7 6] would become anew=[4 2 6 1 3 7 5]
Thank you
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Steven Lord
2018-8-20
Use randperm to select 3 elements (without replacement) from your vector.
a = [4 2 3 1 5 7 6]
ind = randperm(numel(a), 3)
a(ind) = a(ind([3 1 2]))
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KALYAN ACHARJYA
2018-8-20
编辑:KALYAN ACHARJYA
2018-8-20
% I have tried this only swap two elements or even numbers, definite swap with each other is only possible in even numbers.
a=randperm(7)
idx=randperm(3);
a(idx)=a(fliplr(idx))
I have tried in another way, you can do that
a=randperm(7)
n=randi(5);
new_array=a(:,:);
new_array([n n+1 n+2])=a([n+2 n n+1])
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