Did you ask for assistance on R-Sig-Debian? you will need to be more explicit than below about what you actually did. FWIW I was able to do it [1]... you might have encountered a temporary network problem.
[1] https://cran.r-project.org/bin/linux/ubuntu/README.html On July 14, 2019 4:55:25 PM CDT, Richard O'Keefe <rao...@gmail.com> wrote: >Four-core AMD E2-7110 running Ubuntu 18.04 LTS. >The R version is the latest in the repository: >r-base/bionic,bionic,now 3.4.4-1ubuntu1 all [installed] > >Why not 3.6? Because when i followed the installation instructions, >adding > >deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/ > >to /etc/apt/sources.list, sudo apt update reported > >W: GPG error: https://cloud.r-project.org/bin/linux/ubuntu >bionic-cran35/ >InRelease: The following signatures couldn't be verified because the >public >key is not available: NO_PUBKEY 51716619E084DAB9 >E: The repository 'https://cloud.r-project.org/bin/linux/ubuntu >bionic-cran35/ InRelease' is not signed. >N: Updating from such a repository can't be done securely, and is >therefore >disabled by default. >N: See apt-secure(8) manpage for repository creation and user >configuration >details. > >I just repeated the test. >> x <- runif(1000000) >> y <- runif(1000000) >> system.time(ifelse(x<y,x,y)) > user system elapsed > 0.359 0.043 0.404 >> system.time(pmin(x,y)) > user system elapsed > 0.015 0.008 0.023 >> system.time({r<-numeric(1000000);ix <- x < y; r[ix]<-x[ix]; >r[!ix]<-y[!ix]; r}) > user system elapsed > 0.077 0.028 0.105 > >On Mon, 15 Jul 2019 at 08:00, peter dalgaard <pda...@gmail.com> wrote: >> >> Er, what version is this? I have (on a late 2010 MB Air!) >> >> > system.time(ifelse(x < y, x, y)) >> user system elapsed >> 0.072 0.012 0.085 >> >> and even >> >> > system.time({r<-numeric(1000000);ix <- x < y; r[ix]<-x[ix]; >r[!ix]<-y[!ix]; r}) >> user system elapsed >> 0.082 0.053 0.135 >> >> -pd >> >> >> > On 12 Jul 2019, at 15:02 , Richard O'Keefe <rao...@gmail.com> >wrote: >> > >> > "ifelse is very slow"? Benchmark time. >> >> x <- runif(1000000) >> >> y <- runif(1000000) >> >> system.time(ifelse(x < y, x, y)) >> > user system elapsed >> > 0.403 0.044 0.448 >> >> system.time(y + (x < y)*(x - y)) >> > user system elapsed >> > 0.026 0.012 0.038 >> > >> > This appears to be a quality-of-implementation bug. >> > >> > >> > On Thu, 11 Jul 2019 at 04:14, Dénes Tóth <toth.de...@kogentum.hu> >wrote: >> > >> >> >> >> >> >> On 7/10/19 5:54 PM, Richard O'Keefe wrote: >> >>> Expectation: ifelse will use the same "repeat vectors to match >the >> >> longest" >> >>> rule that other vectorised functions do. So >> >>> a <- 1:5 >> >>> b <- c(2,3) >> >>> ifelse(a < 3, 1, b) >> >>> => ifelse(T T F F F <<5>>, 1 <<1>>, 2 3 <<2>>) >> >>> => ifelse(T T F F F <<5>>, 1 1 1 1 1 <<5>>, 2 3 2 3 2 <<5>>) >> >>> => 1 1 2 3 2 >> >>> and that is indeed the answer you get. Entirely predictable and >> >> consistent >> >>> with >> >>> other basic operations in R. >> >>> >> >>> The only tricky thing I see is that R has >> >>> a strict vectorised ifelse(logical.vector, some.vector, >another.vector) >> >>> AND >> >>> a non-strict non-vectorised if (logical.scalar) some.value else >> >>> another.value >> >>> AND >> >>> a statement form if (logical.scalar) stmt.1; else stmt.2; >> >> >> >> Just for the records, there is a further form: >> >> `if`(logical.scalar, stmt.1, stmt.2) >> >> >> >> The main problem with ifelse is that 1) it is very slow, and 2) >the >mode >> >> of its return value can be unintuitive or not too predictable (see >also >> >> the Value and Warning sections of ?ifelse). One has to be very >careful >> >> and ensure that 'yes' and 'no' vectors have the same class, >because >> >> ifelse will not warn you at all: >> >>> ifelse(c(TRUE, TRUE), 1:2, LETTERS[1:2]) >> >> [1] 1 2 >> >>> ifelse(c(TRUE, FALSE), 1:2, LETTERS[1:2]) >> >> [1] "1" "B" >> >> >> >> For options instead of base::ifelse, you might find this >discussion >> >> helpful: >> >> https://github.com/Rdatatable/data.table/issues/3657 >> >> >> >> >> >> Cheers, >> >> Denes >> >> >> >> >> >>> >> >>> >> >>> On Thu, 11 Jul 2019 at 01:47, Eric Berger <ericjber...@gmail.com> >wrote: >> >>> >> >>>> For example, can you predict what the following code will do? >> >>>>> a <- 1:5 >> >>>>> b <- c(2,3) >> >>>>> ifelse( a < 3, 1, b) >> >>>> >> >>>> >> >>>> On Wed, Jul 10, 2019 at 4:34 PM José María Mateos < >ch...@rinzewind.org> >> >>>> wrote: >> >>>> >> >>>>> On Wed, Jul 10, 2019, at 04:39, Eric Berger wrote: >> >>>>>> 1. The ifelse() command is a bit tricky in R. Avoiding it is >often >a >> >>>> good >> >>>>>> policy. >> >>>>> >> >>>>> You piqued my curiosity, can you elaborate a bit more on this? >> >>>>> >> >>>>> -- >> >>>>> José María (Chema) Mateos || https://rinzewind.org >> >>>>> >> >>>>> ______________________________________________ >> >>>>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, >see >> >>>>> 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 mailing list -- To UNSUBSCRIBE and more, >see >> >>>> 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 mailing list -- To UNSUBSCRIBE and more, see >> >>> 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 mailing list -- To UNSUBSCRIBE and more, see >> > 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. >> >> -- >> Peter Dalgaard, Professor, >> Center for Statistics, Copenhagen Business School >> Solbjerg Plads 3, 2000 Frederiksberg, Denmark >> Phone: (+45)38153501 >> Office: A 4.23 >> Email: pd....@cbs.dk Priv: pda...@gmail.com >> >> >> >> >> >> >> >> > > [[alternative HTML version deleted]] > >______________________________________________ >R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >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. -- Sent from my phone. Please excuse my brevity. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
