Randperm generating the same sequence of permutation

2015 6 17
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更新时间：2015 6 17
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I am using randperm to generate different random permutations (subset of the data) from a data set. However even after 2 iterations it is generating the same combination of the number. For eg: the desired output would be like p={1,3,5,6,9,10},{4,6,7,2,1,3}... however i am getting p={1,4,5,7,8},{1,4,5,7,8}. its the same sequence i am getting.
saikath

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Azzi Abdelmalek
Azzi Abdelmalek 2015-6-17
编辑：Azzi Abdelmalek 2015-6-17

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for k=1:3
out{k}=randperm(10,5)
end
celldisp(out)

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i used the for loop to generate different subsets and selected randomly from them. Thanks a lot

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James Tursa
James Tursa 2015-6-17

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Are you resetting the random number generator in between iterations?

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Saikath Bhattacharya
编辑：Saikath Bhattacharya 2015-6-17
yes, i need a random sequence, then perform testing, in the next iteration generate a new random sequence and perform new testing.This step is repeated over the iteration.
James Tursa
James Tursa 2015-6-17
randperm uses the random number generator, so in effect you are also resetting randperm. To get different sampling in each iteration, don't reset the random number generator.
Guillaume
Guillaume 2015-6-17
You can use two different RandStream, one for the random sequence generation, one for randperm.
Thanks a lot. i figured it a different approach, i generated 100 random subjects. and selecting random subject at a time and kept it in an iteration.
Thanks a lot

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