[R] onet.permutation()

[song_gpqg]

I saw the manual of this function but not sure what to do. 
I have a array contain 7 numbers and want to choose 4 to do permutation
test. But using this function with parameters as onet.permutation(scores,4),
it returns 0. Instead, with no parameter, onet.permutation(), it returns
something but every time it's different.
Please tell me how am I supposed to do it.
Thanks a lot

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