Swap k elements in an n x1 vector

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Josue Ortega 2022-11-16

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评论： Stephen23 2022-11-16

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Hi I have a vector which is a random permutation of [1:n]. Say

x=randperm(n)

I want to create a vector that is equal to x, but different in at most c positions. For example, if c=2 and

x=[1 2 3 4 5 6]

I want to create a vector that looks like

x=[3 2 1 4 5 6]

Any suggestions?

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Stephen23 2022-11-16

Do you require a strict derangement of the swapped values (i.e. swapped values cannot be randomly returned to the same location) or is it permitted that values might be returned to the same location?

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Answer 1

Rik 2022-11-16

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Create a logical vector with at most c true elements. Then permute the values at those positions and use logical indexing to store them back into the original array.