swap only 2 elements in an array

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Erik Lee
Erik Lee 2015-10-13
回答： Mohammed 2023-5-27
I'm try to come up with a function that can randomly swap 2 elements (and only 2 at a time) from an array of 20 unique numbers.
Say a=randperm(20) a=[4 1 9 13 5 20 19 ....] would become anew=[19 1 9 13 5 20 4 ....]

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采纳的回答

Star Strider
Star Strider 2015-10-13
This works:
a=[4 1 9 13 5 20 19]
a([1 7]) = a([7 1])
a =
4 1 9 13 5 20 19
a =
19 1 9 13 5 20 4
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更多回答（2 个）

Guillaume
Guillaume 2015-10-13
a = randperm(20)
swapidx = randperm(numel(a), 2);
a(swapidx) = a(fliplr(swapidx))
Mohammed
Mohammed 2023-5-27
if the array is 2D ( two dimantion ) you can use this and get it how it work
a=[10 20
30 40 ]
%For swapping number in Array 2D
%[10 is a 1] & [30 is 2] & [20 is a 3] & 40 is a 4
a([2 3])=a([3 2])
OUTPUT:
a =
10 20
30 40
a =
10 30
20 40

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