Does using rng guarantee having exactly the same result in each simulation?

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Zeynab Mousavikhamene 2020-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/520574-does-using-rng-guarantee-having-exactly-the-same-result-in-each-simulation

评论： Zeynab Mousavikhamene 2020-4-25

I am using rng to be able to reproduce data in each simulation. But I noticed there is a slightly difference for the result in each simulation (around 1%). Is it normal?

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Zeynab Mousavikhamene 2020-4-25

@Stephen Cobeldick:

My qustion was that when I use rng(1) in the loop I get different answer compared to when I use rng(1) on its own (around 1% of difference).

Zeynab Mousavikhamene 2020-4-25

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@Walter Roberson:

I edited the comment and added clearer explanation (more clue):

I am using rng in a loop sth like this:

for i=1:..
    for rng_idx=10:-1:1
    rng(rng_idx,'twister');  
    ...
    end
end

for i=1 and rng_idx=1 I get the same answer compared to when not having for loop for rng_idx and with setting rng(1). But for the rest, I get different answer e.g. I mean for i=2 and rng_idx=1 I get different answer when I used for i=2 without any loop for rng and with setting rng(1)

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