-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf
Of Nordlund, Dan (DSHS/RDA)
Sent: Monday, March 18, 2013 12:44 PM
To: C W
Cc: r-help
Subject: Re: [R] How to stop set.seed() besides exiting out of R?
No, you cannot unset the seed. You can set it to a different value, but a the
random
number generators always need a starting seed. If you don’t set one, R will
set one for
you , you just won’t know what it is. And as a practical matter, given a
sequence of
random numbers you can’t tell what the starting seed was. That is the point of
good
random number generators. Each sequence of random numbers for most intents and
purposes can be considered independent from previous sets of numbers.
Hope this is helpful,
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:tmrs...@gmail.com]
Sent: Monday, March 18, 2013 12:19 PM
To: Nordlund, Dan (DSHS/RDA)
Cc: r-help
Subject: Re: [R] How to stop set.seed() besides exiting out of R?
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)
<nord...@dshs.wa.gov<mailto:nord...@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:tmrs...@gmail.com<mailto:tmrs...@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)
<nord...@dshs.wa.gov<mailto:nord...@dshs.wa.gov><mailto:nord...@dshs.wa.gov<
mailto:nord...@dshs.wa.gov>>> wrote:
-----Original Message-----
From:
r-help-boun...@r-project.org<mailto:r-help-boun...@r-project.org><mailto:r-
help-boun...@r-project.org<mailto:r-help-boun...@r-project.org>> [mailto:r-help-
bounces@r-<mailto:r-help-bounces@r-><mailto:r-help-bounces@r-<mailto:r-help-
bounces@r->>
project.org<http://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@r-project.org<mailto:R-help@r-project.org><mailto:R-help@r-
project.org<mailto:R-help@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.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org<mailto:R-help@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.
[[alternative HTML version deleted]]
