Randperm generating the same sequence of permutation

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

Answer 1

[Azzi Abdelmalek]

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

[Saikath Bhattacharya]

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

Answer 2

[James Tursa]

Are you resetting the random number generator in between iterations?

[Saikath Bhattacharya]

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]

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]

You can use two different RandStream, one for the random sequence generation, one for randperm.

[Saikath Bhattacharya]

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