How to generate k unique random numbers from 1 to n in matlab 2009

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chanukya
chanukya 2013-4-27
Hi, I knew randperm(n,k) works but this is after 2011. Can some one tell me if there is any efficient way to do it in matlab 2009.
Thanks

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-4-27
[idx,idx]=sort(rand(1,n));
out=idx(1:k)
  1 个评论
Jan
Jan 2013-4-27
The result is biased, because Matlab's sort is stable. The effects are very tiny and they appear in Matlab's randperm function with 1 input argument also.

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更多回答（2 个）

Zhang lu
Zhang lu 2013-4-27
a=randperm(n); b=a(1:k)
Jan
Jan 2013-4-27
Not biased and faster than sorting a RAND vector: http://www.mathworks.com/matlabcentral/fileexchange/27076-shuffle

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