[R-SIG-Mac] set.seed

[peter dalgaard]

> On 23 Jan 2020, at 12:15 , Adrian Dușa <dusa.adrian using unibuc.ro> wrote:
> 
> Dear Peter,
> 
> Thanks, it's good to know there is a good explanation for this and also the sample.kind is now more stable.
> Curiously though, I run the very same R version on both computers and I would have expected RNGkind() to work the same.

The most likely explanation is that on one machine you had (like I did)

$ R

R version 3.6.0 (2019-04-26) -- "Planting of a Tree"
Copyright (C) 2019 The R Foundation for Statistical Computing
....blablabla...

[Previously saved workspace restored]

> set.seed(12)
> sample(letters[1:10])
 [1] "a" "h" "i" "b" "g" "j" "e" "f" "d" "c"
> RNGkind()
[1] "Mersenne-Twister" "Inversion"        "Rounding"        


...whereas

$ R --vanilla -q
> set.seed(12)
> sample(letters[1:10])
 [1] "b" "g" "c" "f" "e" "i" "d" "j" "h" "a"
> RNGkind()
[1] "Mersenne-Twister" "Inversion"        "Rejection"       



-pd

> 
> Best,
> Adrian
> 
> On Thu, Jan 23, 2020 at 11:18 AM peter dalgaard <pdalgd using gmail.com> wrote:
> >
> > That's the effect of RNGkind(sample.kind="Rejection") which is the new default. Unfortunately, the older and buggy "Rounding" has a tendency to linger in saved workspaces.
> >
> > -pd
> >
> > > RNGkind(sample.kind="Rejection")
> > > set.seed(12)
> > > sample(letters[1:10])
> >  [1] "b" "g" "c" "f" "e" "i" "d" "j" "h" "a"
> > > RNGkind(sample.kind="Rounding")
> > Warning message:
> > In RNGkind(sample.kind = "Rounding") : non-uniform 'Rounding' sampler used
> > > set.seed(12)
> > > sample(letters[1:10])
> >  [1] "a" "h" "i" "b" "g" "j" "e" "f" "d" "c"
> >
> >
> > > On 23 Jan 2020, at 09:51 , Adrian Dușa via R-SIG-Mac <r-sig-mac using r-project.org> wrote:
> > >
> > > Dear All,
> > >
> > > I've recently acquired a new MacBook, and while transferring my files and
> > > settings I noticed something I did not expect:
> > >
> > > Old Mac:
> > >> set.seed(12)
> > >> sample(letters[1:10])
> > > [1] "a" "h" "i" "b" "g" "j" "e" "f" "d" "c"
> > >
> > >
> > > New Mac:
> > >> set.seed(12)
> > >> sample(letters[1:10])
> > > [1] "b" "g" "c" "f" "e" "i" "d" "j" "h" "a"
> > >
> > > For numbers I don't see anything different, the examples from ?set.seed
> > > producing the same results. Both R versions are the same (3.6.2) and both
> > > computers run macOS Catalina 10.15.2.
> > >
> > > I would be grateful for any advice,
> > > Adrian
> > >
> > > --
> > > Adrian Dusa
> > > University of Bucharest
> > > Romanian Social Data Archive
> > > Soseaua Panduri nr. 90-92
> > > 050663 Bucharest sector 5
> > > Romania
> > > https://adriandusa.eu
> > >
> > >       [[alternative HTML version deleted]]
> > >
> > > _______________________________________________
> > > R-SIG-Mac mailing list
> > > R-SIG-Mac using r-project.org
> > > https://stat.ethz.ch/mailman/listinfo/r-sig-mac
> >
> > --
> > Peter Dalgaard, Professor,
> > Center for Statistics, Copenhagen Business School
> > Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> > Phone: (+45)38153501
> > Office: A 4.23
> > Email: pd.mes using cbs.dk  Priv: PDalgd using gmail.com
> >
> >
> >
> >
> >
> >
> >
> >
> >
> 
> 
> --
> Adrian Dusa
> University of Bucharest
> Romanian Social Data Archive
> Soseaua Panduri nr. 90-92
> 050663 Bucharest sector 5
> Romania
> https://adriandusa.eu

-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes using cbs.dk  Priv: PDalgd using gmail.com