How do I reproduce the same set of unique random numbers within PARFOR in Parallel Computing Toolbox 5.0 (R2010b) ?

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Sanchali Purandare 2011-1-16

1
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https://ww2.mathworks.cn/matlabcentral/answers/97-how-do-i-reproduce-the-same-set-of-unique-random-numbers-within-parfor-in-parallel-computing-toolbo

I would like to generate the same set of unique random numbers within PARFOR in order to reproduce my simulation.

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Answer 1

Sanchali Purandare 2011-1-16

2
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https://ww2.mathworks.cn/matlabcentral/answers/97-how-do-i-reproduce-the-same-set-of-unique-random-numbers-within-parfor-in-parallel-computing-toolbo#answer_72

在 MATLAB Online 中打开

This could be done in the following manner:

seeds = randi(2^31-1,1,10, 'int32') 
parfor ii=1:10 
 rdstm = RandStream.create('mrg32k3a'); 
 reset(rdstm, seeds(ii)); 
 x(ii,:) = rdstm.randn(1,1); 
end

In the code above, each loop iteration will create a new random stream and will initialize it to some random seed that comes from the outside. So this way as long as you start from the same set of seeds, you can reproduce the simulation. Also,each loop iteration will create its own random number independent of each other loop iteration.