[R] Getting different results with set.seed()

[Jeff Newmiller]

When you provide an actual minimal reproducible example we will be able to help you. 2000 lines is excessive to demonstrate the problem.

Based on your description, I think you are doing some computations before you set seed, and your results depend partly on the values computed prior to the set.seed.

On August 19, 2021 1:10:28 AM PDT, Shah Alam <dr.alamsolangi using gmail.com> wrote:
>Dear Petr,
>
>It is more than 2000 lines of code with a lot of functions and data inputs.
>I am not sure whether it would be useful to upload it. However, you are
>absolutely right. I used
>
>Step 1. Self-coded functions (these functions generate random numbers as
>well)
>
>Step 2: set.seed (123)
>
>Step 3: Call those functions.
>
>Step 4: model results.
>
>I close the R session and run the code from step 1. I get different results
>for the same set of values for parameters.
>
>Best regards,
>Shah
>
>
>
>
>On Thu, 19 Aug 2021 at 09:56, PIKAL Petr <petr.pikal using precheza.cz> wrote:
>
>> Hi
>>
>> Please provide at least your code preferably with some data to reproduce
>> this behaviour. I wonder if anybody could help you without such
>> information.
>>
>> My wild guess is that you used
>>
>> set.seed(1234)
>>
>> some code
>>
>> the code used again
>>
>> in which case you have to expect different results.
>>
>> Cheers
>> Petr
>>
>> > -----Original Message-----
>> > From: R-help <r-help-bounces using r-project.org> On Behalf Of Shah Alam
>> > Sent: Thursday, August 19, 2021 9:46 AM
>> > To: r-help mailing list <r-help using r-project.org>
>> > Subject: [R] Getting different results with set.seed()
>> >
>> > Dear All,
>> >
>> > I was using set.seed to reproduce the same results for the discrete event
>> > simulation model. I have 12 unknown parameters for optimization (just a
>> > little background). I got a good fit of parameter combinations. However,
>> > when I use those parameters combinations again in the model. I am getting
>> > different results.
>> >
>> > Is there any problem with the set.seed. I assume the set.seed should
>> > produce the same results.
>> >
>> > I used set.seed(1234).
>> >
>> > Best regards,
>> > Shah
>> >
>> >       [[alternative HTML version deleted]]
>> >
>> > ______________________________________________
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>> > PLEASE do read the posting guide http://www.R-project.org/posting-
>> > guide.html
>> > and provide commented, minimal, self-contained, reproducible code.
>>
>
>	[[alternative HTML version deleted]]
>
>______________________________________________
>R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

-- 
Sent from my phone. Please excuse my brevity.