[R] How to stop set.seed() besides exiting out of R?

[Jeff Newmiller]

Your request is meaningless.  The seed itself is effectively overwritten each time a random number is requested. It is only the repeatability of the sequence of random numbers following the set.seed call that is reproducible. You can set the seed to something else, but there is always a seed and it changes as numbers are requested.
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Sent from my phone. Please excuse my brevity.

C W <tmrsg11 at gmail.com> wrote:

>Yes, I agree with you.  I guess what I was really looking for is a
>function
>like UNset.seed()?
>
>By having set.seed(), I can have reproducible code.  But what if I want
>to
>check my work against what's produced from set.seed(100)?
>
>I really want to escape from the shadow of set.seed(), can I unset it?
>
>On Mon, Mar 18, 2013 at 3:07 PM, Nordlund, Dan (DSHS/RDA) <
>NordlDJ at dshs.wa.gov> wrote:
>
>> As I understand it, how R ��normally� does it is to use the system
>clock
>> to set the seed once per session, unless you use set.seed() to set a
>new
>> seed. You chose to set the seed to a different value.  But from that
>point
>> on, the pseudo random number generation continues  in the same way it
>> �normally� does.  In your code below, each of your 100 histograms
>will be
>> different.  If you then execute the for loop again (but not the
>> set.seed(100) statement), you will get a different set of histograms.
> The
>> only way you would be �confined to set.seed(100)� is if you keep
>resetting
>> the seed to 100.
>>
>> Dan
>>
>> Daniel J. Nordlund
>> Washington State Department of Social and Health Services
>> Planning, Performance, and Accountability
>> Research and Data Analysis Division
>> Olympia, WA 98504-5204
>>
>> From: C W [mailto:tmrsg11 at gmail.com]
>> Sent: Monday, March 18, 2013 11:50 AM
>> To: Nordlund, Dan (DSHS/RDA)
>> Cc: r-help
>> Subject: Re: [R] How to stop set.seed() besides exiting out of R?
>>
>> set.seed(100)
>> for (i in 1:100){
>>     a <- rnorm(1000, mean=0, sd=1)
>>     hist(a)
>> }
>>
>> #Now say, I want to simulate without being confined to set.seed(100),
>I
>> just want to get a simulation like how R "normally" does it.
>>
>> Mike
>>
>> On Mon, Mar 18, 2013 at 2:40 PM, Nordlund, Dan (DSHS/RDA) <
>> NordlDJ at dshs.wa.gov<mailto:NordlDJ at dshs.wa.gov>> wrote:
>> > -----Original Message-----
>> > From:
>r-help-bounces at r-project.org<mailto:r-help-bounces at r-project.org>
>> [mailto:r-help-bounces at r-<mailto:r-help-bounces at r->
>> > project.org<http://project.org>] On Behalf Of C W
>> > Sent: Monday, March 18, 2013 11:27 AM
>> > To: r-help
>> > Subject: [R] How to stop set.seed() besides exiting out of R?
>> >
>> > Hi list,
>> >
>> > I am curious how to stop the set.seed(), I don't want the same
>repeated
>> > random number.  I know I can set it to a different seed, but I
>don't
>> > want
>> > to go through the trouble of setting different seed every time.
>> >
>> > Thanks,
>> > Mike
>> >
>> Can you show us how you are using set.seed() that results in getting
>the
>> same sequence repeatedly?  If you are doing simulations in a loop,
>then set
>> the seed once, outside the loop.  Otherwise, I am not sure what you
>are
>> doing that causes problems.  A reproducible example would really
>help.
>>
>> Dan
>>
>> Daniel J. Nordlund
>> Washington State Department of Social and Health Services
>> Planning, Performance, and Accountability
>> Research and Data Analysis Division
>> Olympia, WA 98504-5204
>>
>> ______________________________________________
>> R-help at r-project.org<mailto:R-help at r-project.org> mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
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>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>
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>
>
>
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