How can I repeat the previous state of the random generator?

Question

Jose Ercolino 2018-2-15

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编辑： Jan 2018-2-15

Hi,

I want to repeat the last (or any previous) random sequence that I just generated, but I didn't save the random stream state. It is possible to obtain the previous state if I know the current state?

Thanks in advance.

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Answer 1

Matt J 2018-2-15

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Is the sequence the first you generated since you started up MATLAB? If so, just restart MATLAB and save the state upon startup. It always starts up in the same state.

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Answer 2

Jan 2018-2-15

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编辑：Jan 2018-2-15

In theory it is possible to determine the previous state if you know the current one, because the random number generator is a simple and deterministic program. In practice it can be very expensive.

It is much easier to store the current state, if you need it later.