Resume from latest Randstream

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Sebastian Thuné 2021-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/805976-resume-from-latest-randstream

评论： Sebastian Thuné 2021-4-21

Hi,

I am generating some data with matlab over azure. While generating data I use rand.

 x = x_limits(1) + rand*(x_limits(2)-x_limits(1));
 z = z_limits(1) + rand*(z_limits(2)-z_limits(1));
 

I usually generate a couple of MB of data (~200k samples) which I then use and perform tests on and then depending on the results from the test I generate more. However I have encountered a problem which is that when starting the script for generating data again It gives me the exact same as the previous generated data file. Even if I use:

rng('shuffle')

I still get a data file containing a lot of the same data. Is there a way in which I can save where my randstream finsihed in a lets say randState.mat file that I can later call when resuming data generator. Basically, picking up where the randstream last was used.

Thanks!

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Answer 1

Divija Aleti 2021-4-21

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Hi Sebastian,

Setting the seed of "rng" to 'shuffle' helps getting different sequence of random numbers after each call to rng, but these sequences are not necessarily independent.

To get independent sequences, consider specifying the "Substream" property of "RandStream" or using "RandStream.create". You can find details of these in the links given below:

RandStream

RandStream.create

For examples for creating multiple streams, refer to the following link:

Multiple Streams

Hope this helps!

Regards,

Divija