When I run the following few lines of code, I get the attached behavior where the first few elements of using randn will be the same but after a while (not sure if machine dependent) the same rng will diverge, but only with randn as rand works as expected. Just wanted to ask here if folks had an exp…

@rfourquet Pinging you as our native Random expert.

I think this is from https://github.com/JuliaLang/julia/pull/35078 .

Yeah, that must be it. I suspected that it was some optimization for batch producing the randoms, but was really scratching my head. It seems a little bit breaking that they don’t produce the same sequence since N randn values should be the same with the same seed, but if people know about this then…

[image] klowrey: but only with randn as rand works as expected Note that the same behavior exists also with rand, for a bigger N.

Randn isn't consistent with Seed?

General Usage

palday September 24, 2021, 2:14pm 7

See also Weird PRNG behavior

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Same random seed, but different random numbers? General Usage	11	2883	July 5, 2022
Weird PRNG behavior Statistics random	4	706	October 19, 2021
Reproducibility of multiple calls to rand New to Julia reproducibility	10	849	May 28, 2020
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Randn isn't consistent with Seed?

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